VB.Net Tutorial/GUI/MDI

Add children form to parent form

Imports System.Windows.Forms
Imports System.Drawing.Text
Imports System.Drawing
Imports System.Drawing.Drawing2D
public class MDIAddChildToParent
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Public mycount As Integer
    Private Sub ToolStripMenuItem2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripMenuItem2.Click
        Dim i As Integer
        Dim newdoc As Form2            
        mycount = mycount + 1          
        newdoc = New Form2()           
        newdoc.Text = "Doc" + Str(mycount) 
        newdoc.MdiParent = Me               
        newdoc.Show()
    End Sub
    Private Sub ToolStripMenuItem6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripMenuItem6.Click
        Me.ActiveMdiChild.Text = Me.ActiveMdiChild.Text
    End Sub
End Class
<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.MenuStrip1 = New System.Windows.Forms.MenuStrip
        Me.ToolStripMenuItem1 = New System.Windows.Forms.ToolStripMenuItem
        Me.ToolStripMenuItem2 = New System.Windows.Forms.ToolStripMenuItem
        Me.ToolStripMenuItem3 = New System.Windows.Forms.ToolStripMenuItem
        Me.ToolStripMenuItem4 = New System.Windows.Forms.ToolStripMenuItem
        Me.ToolStripMenuItem5 = New System.Windows.Forms.ToolStripMenuItem
        Me.ToolStripMenuItem6 = New System.Windows.Forms.ToolStripMenuItem
        Me.MenuStrip1.SuspendLayout()
        Me.SuspendLayout()
        "
        "MenuStrip1
        "
        Me.MenuStrip1.Items.AddRange(New System.Windows.Forms.ToolStripItem() {Me.ToolStripMenuItem1, Me.ToolStripMenuItem5})
        Me.MenuStrip1.Location = New System.Drawing.Point(0, 0)
        Me.MenuStrip1.MdiWindowListItem = Me.ToolStripMenuItem5
        Me.MenuStrip1.Name = "MenuStrip1"
        Me.MenuStrip1.Padding = New System.Windows.Forms.Padding(8, 2, 0, 2)
        Me.MenuStrip1.Size = New System.Drawing.Size(569, 24)
        Me.MenuStrip1.TabIndex = 2
        Me.MenuStrip1.Text = "MenuStrip1"
        "
        "ToolStripMenuItem1
        "
        Me.ToolStripMenuItem1.DropDownItems.AddRange(New System.Windows.Forms.ToolStripItem() {Me.ToolStripMenuItem2, Me.ToolStripMenuItem3, Me.ToolStripMenuItem4})
        Me.ToolStripMenuItem1.Name = "ToolStripMenuItem1"
        Me.ToolStripMenuItem1.Size = New System.Drawing.Size(49, 20)
        Me.ToolStripMenuItem1.Text = "File"
        "
        "ToolStripMenuItem2
        "
        Me.ToolStripMenuItem2.Name = "ToolStripMenuItem2"
        Me.ToolStripMenuItem2.Size = New System.Drawing.Size(152, 22)
        Me.ToolStripMenuItem2.Text = "new"
        "
        "ToolStripMenuItem3
        "
        Me.ToolStripMenuItem3.Name = "ToolStripMenuItem3"
        Me.ToolStripMenuItem3.Size = New System.Drawing.Size(152, 22)
        Me.ToolStripMenuItem3.Text = "save"
        "
        "ToolStripMenuItem4
        "
        Me.ToolStripMenuItem4.Name = "ToolStripMenuItem4"
        Me.ToolStripMenuItem4.Size = New System.Drawing.Size(152, 22)
        Me.ToolStripMenuItem4.Text = "Quit"
        "
        "ToolStripMenuItem5
        "
        Me.ToolStripMenuItem5.DropDownItems.AddRange(New System.Windows.Forms.ToolStripItem() {Me.ToolStripMenuItem6})
        Me.ToolStripMenuItem5.Name = "ToolStripMenuItem5"
        Me.ToolStripMenuItem5.Size = New System.Drawing.Size(49, 20)
        Me.ToolStripMenuItem5.Text = "Edit"
        "
        "ToolStripMenuItem6
        "
        Me.ToolStripMenuItem6.Name = "ToolStripMenuItem6"
        Me.ToolStripMenuItem6.Size = New System.Drawing.Size(152, 22)
        Me.ToolStripMenuItem6.Text = "rename"
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(8.0!, 15.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(569, 275)
        Me.Controls.Add(Me.MenuStrip1)
        Me.IsMdiContainer = True
        Me.Margin = New System.Windows.Forms.Padding(4, 4, 4, 4)
        Me.MenuStrip1.ResumeLayout(False)
        Me.MenuStrip1.PerformLayout()
        Me.ResumeLayout(False)
        Me.PerformLayout()
    End Sub
    Friend WithEvents MenuStrip1 As System.Windows.Forms.MenuStrip
    Friend WithEvents ToolStripMenuItem1 As System.Windows.Forms.ToolStripMenuItem
    Friend WithEvents ToolStripMenuItem2 As System.Windows.Forms.ToolStripMenuItem
    Friend WithEvents ToolStripMenuItem3 As System.Windows.Forms.ToolStripMenuItem
    Friend WithEvents ToolStripMenuItem4 As System.Windows.Forms.ToolStripMenuItem
    Friend WithEvents ToolStripMenuItem5 As System.Windows.Forms.ToolStripMenuItem
    Friend WithEvents ToolStripMenuItem6 As System.Windows.Forms.ToolStripMenuItem
End Class
Public Class Form2
    Private Sub Form2_Resize(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Resize
        TextBox1.Top = 5
        TextBox1.Left = 5
        TextBox1.Width = Me.Width - 20
        TextBox1.Height = Me.Height - 45
    End Sub
End Class
<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Class Form2
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.SuspendLayout()
        "
        "TextBox1
        "
        Me.TextBox1.Location = New System.Drawing.Point(12, 12)
        Me.TextBox1.Multiline = True
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.ScrollBars = System.Windows.Forms.ScrollBars.Both
        Me.TextBox1.Size = New System.Drawing.Size(294, 166)
        Me.TextBox1.TabIndex = 0
        "
        "Form2
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 12.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(318, 190)
        Me.Controls.Add(Me.TextBox1)
        Me.ResumeLayout(False)
        Me.PerformLayout()
    End Sub
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
End Class

Demonstrating the use of MDI parent and child windows

Imports System.IO
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class UsingMDI
   public Shared Sub Main
        Application.Run(New FrmUsingMDI)
   End Sub
End class
Public Class FrmUsingMDI
   Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
   Public Sub New()
      MyBase.New()
      "This call is required by the Windows Form Designer.
      InitializeComponent()
      "Add any initialization after the InitializeComponent() call
   End Sub
   "Form overrides dispose to clean up the component list.
   Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
      If disposing Then
         If Not (components Is Nothing) Then
            components.Dispose()
         End If
      End If
      MyBase.Dispose(disposing)
   End Sub
   " main menu containing menu items File and Window
   Friend WithEvents mnuMain As MainMenu
   " menu containing submenu New and menu item Exit
   Friend WithEvents mnuitmFile As MenuItem
   Friend WithEvents mnuitmExit As MenuItem
   " submenu New
   Friend WithEvents mnuitmNew As MenuItem
   Friend WithEvents mnuitmChild1 As MenuItem
   Friend WithEvents mnuitmChild2 As MenuItem
   Friend WithEvents mnuitmChild3 As MenuItem
   " menu containing menu items Cascade, TileHorizontal and 
   " TileVertical
   Friend WithEvents mnuitmWindow As MenuItem
   Friend WithEvents mnuitmCascade As MenuItem
   Friend WithEvents mnuitmTileHorizontal As MenuItem
   Friend WithEvents mnuitmTileVertical As MenuItem
   "Required by the Windows Form Designer
   Private components As System.ruponentModel.Container
   "NOTE: The following procedure is required by the Windows Form Designer
   "It can be modified using the Windows Form Designer.  
   "Do not modify it using the code editor.
   <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
      Me.mnuitmTileHorizontal = New System.Windows.Forms.MenuItem()
      Me.mnuitmTileVertical = New System.Windows.Forms.MenuItem()
      Me.mnuitmChild1 = New System.Windows.Forms.MenuItem()
      Me.mnuitmCascade = New System.Windows.Forms.MenuItem()
      Me.mnuitmChild2 = New System.Windows.Forms.MenuItem()
      Me.mnuMain = New System.Windows.Forms.MainMenu()
      Me.mnuitmFile = New System.Windows.Forms.MenuItem()
      Me.mnuitmNew = New System.Windows.Forms.MenuItem()
      Me.mnuitmChild3 = New System.Windows.Forms.MenuItem()
      Me.mnuitmExit = New System.Windows.Forms.MenuItem()
      Me.mnuitmWindow = New System.Windows.Forms.MenuItem()
      "
      "mnuitmTileHorizontal
      "
      Me.mnuitmTileHorizontal.Index = 1
      Me.mnuitmTileHorizontal.Text = "Tile Horizontal"
      "
      "mnuitmTileVertical
      "
      Me.mnuitmTileVertical.Index = 2
      Me.mnuitmTileVertical.Text = "Tile Vertical"
      "
      "mnuitmChild1
      "
      Me.mnuitmChild1.Index = 0
      Me.mnuitmChild1.Text = "Child1"
      "
      "mnuitmCascade
      "
      Me.mnuitmCascade.Index = 0
      Me.mnuitmCascade.Text = "Cascade"
      "
      "mnuitmChild2
      "
      Me.mnuitmChild2.Index = 1
      Me.mnuitmChild2.Text = "Child2"
      "
      "mnuMain
      "
      Me.mnuMain.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.mnuitmFile, Me.mnuitmWindow})
      "
      "mnuitmFile
      "
      Me.mnuitmFile.Index = 0
      Me.mnuitmFile.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.mnuitmNew, Me.mnuitmExit})
      Me.mnuitmFile.Text = "File"
      "
      "mnuitmNew
      "
      Me.mnuitmNew.Index = 0
      Me.mnuitmNew.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.mnuitmChild1, Me.mnuitmChild2, Me.mnuitmChild3})
      Me.mnuitmNew.Text = "New"
      "
      "mnuitmChild3
      "
      Me.mnuitmChild3.Index = 2
      Me.mnuitmChild3.Text = "Child3"
      "
      "mnuitmExit
      "
      Me.mnuitmExit.Index = 1
      Me.mnuitmExit.Text = "Exit"
      "
      "mnuitmWindow
      "
      Me.mnuitmWindow.Index = 1
      Me.mnuitmWindow.MdiList = True
      Me.mnuitmWindow.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.mnuitmCascade, Me.mnuitmTileHorizontal, Me.mnuitmTileVertical})
      Me.mnuitmWindow.Text = "Window"
      "
      "FrmUsingMDI
      "
      Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
      Me.ClientSize = New System.Drawing.Size(360, 301)
      Me.IsMdiContainer = True
      Me.Menu = Me.mnuMain
      Me.Name = "FrmUsingMDI"
      Me.Text = "UsingMDI"
   End Sub
#End Region
   Private childWindow As FrmChild
   Private Sub mnuitmChild1_Click( _
      ByVal sender As System.Object, _
      ByVal e As System.EventArgs) Handles mnuitmChild1.Click
      childWindow = New FrmChild("Child1")
      childWindow.MdiParent = Me 
      childWindow.Show()         
   End Sub 
   Private Sub mnuitmChild2_Click( _
      ByVal sender As System.Object, _
      ByVal e As System.EventArgs) Handles mnuitmChild2.Click
      childWindow = New FrmChild("Child2")
      childWindow.MdiParent = Me 
      childWindow.Show()         
   End Sub 
   Private Sub mnuitmChild3_Click( _
      ByVal sender As System.Object, _
      ByVal e As System.EventArgs) Handles mnuitmChild3.Click

      childWindow = New FrmChild("Child3")
      childWindow.MdiParent = Me 
      childWindow.Show()         
   End Sub 
   
   Private Sub mnuitmExit_Click(ByVal sender As System.Object, _
      ByVal e As System.EventArgs) Handles mnuitmExit.Click
      Application.Exit()
   End Sub 
   
   Private Sub mnuitmCascade_Click(ByVal sender As System.Object, _
      ByVal e As System.EventArgs) Handles mnuitmCascade.Click
      Me.LayoutMdi(MdiLayout.Cascade)
   End Sub
   
   Private Sub mnuitmTileHorizontal_Click _
      (ByVal sender As System.Object, ByVal e As System.EventArgs) _
      Handles mnuitmTileHorizontal.Click
      Me.LayoutMdi(MdiLayout.TileHorizontal)
   End Sub
   Private Sub mnuitmTileVertical_Click _
      (ByVal sender As System.Object, _
      ByVal e As System.EventArgs) Handles mnuitmTileVertical.Click
      Me.LayoutMdi(MdiLayout.TileVertical)
   End Sub
End Class
Public Class FrmChild
   Inherits Form
#Region " Windows Form Designer generated code "
   Public Sub New()
      MyBase.New()
      "This call is required by the Windows Form Designer.
      InitializeComponent()
      "Add any initialization after the InitializeComponent() call
   End Sub
   "   Public Sub New(ByVal imageInformation As String, ByVal windowName As String)
   "      Display(imageInformation, windowName)
   "   End Sub
   "Form overrides dispose to clean up the component list.
   Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
      If disposing Then
         If Not (components Is Nothing) Then
            components.Dispose()
         End If
      End If
      MyBase.Dispose(disposing)
   End Sub
   " contains an image loaded from disk
   Friend WithEvents picDisplay As PictureBox
   "Required by the Windows Form Designer
   Private components As System.ruponentModel.Container
   "NOTE: The following procedure is required by the Windows Form Designer
   "It can be modified using the Windows Form Designer.  
   "Do not modify it using the code editor.
   <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
      Me.picDisplay = New System.Windows.Forms.PictureBox()
      Me.SuspendLayout()
      "
      "picDisplay
      "
      Me.picDisplay.Location = New System.Drawing.Point(8, 8)
      Me.picDisplay.Name = "picDisplay"
      Me.picDisplay.Size = New System.Drawing.Size(256, 208)
      Me.picDisplay.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize
      Me.picDisplay.TabIndex = 0
      Me.picDisplay.TabStop = False
      "
      "FrmChild1
      "
      Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
      Me.ClientSize = New System.Drawing.Size(272, 221)
      Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.picDisplay})
      Me.Name = "FrmChild"
      Me.Text = ""
      Me.ResumeLayout(False)
   End Sub
#End Region
   Public Sub New( ByVal name As String)
      Me.New()
      Me.Text = name
      picDisplay.Image = Image.FromFile("YourFile.bmp")
   End Sub  " New
End Class

MDI Children Form Array

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class MDIChildrenFormArray
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
    Public Sub New()
        MyBase.New()
        "This call is required by the Windows Form Designer.
        InitializeComponent()
        "Add any initialization after the InitializeComponent() call
    End Sub
    "Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.IsMdiContainer = True
        Me.Name = "Form1"
        Me.Text = "Form1"
    End Sub
#End Region
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim Forms(4) As Form2
        For i As Integer = 0 To 4
            Forms(i) = New Form2
            Forms(i).Text = "Document" & Str(i)
            Forms(i).MdiParent = Me
            Forms(i).Show()
        Next i
        Me.LayoutMdi(MdiLayout.Cascade)
    End Sub
End Class

Public Class Form2
    Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
    Public Sub New()
        MyBase.New()
        "This call is required by the Windows Form Designer.
        InitializeComponent()
        "Add any initialization after the InitializeComponent() call
    End Sub
    "Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.SuspendLayout()
        "
        "TextBox1
        "
        Me.TextBox1.Dock = System.Windows.Forms.DockStyle.Fill
        Me.TextBox1.Location = New System.Drawing.Point(0, 0)
        Me.TextBox1.Multiline = True
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(292, 273)
        Me.TextBox1.TabIndex = 0
        Me.TextBox1.Text = ""
        "
        "Form2
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.Add(Me.TextBox1)
        Me.Name = "Form2"
        Me.Text = "Form2"
        Me.ResumeLayout(False)
    End Sub
#End Region
End Class

Open children window in menu action

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class OpenChildrenFormInMenuAction
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
    Public Sub New()
        MyBase.New()
        "This call is required by the Windows Form Designer.
        InitializeComponent()
        "Add any initialization after the InitializeComponent() call
    End Sub
    "Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents MenuItem1 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem2 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem3 As System.Windows.Forms.MenuItem
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.MainMenu1 = New System.Windows.Forms.MainMenu
        Me.MenuItem1 = New System.Windows.Forms.MenuItem
        Me.MenuItem2 = New System.Windows.Forms.MenuItem
        Me.MenuItem3 = New System.Windows.Forms.MenuItem
        "
        "MainMenu1
        "
        Me.MainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem1, Me.MenuItem3})
        "
        "MenuItem1
        "
        Me.MenuItem1.Index = 0
        Me.MenuItem1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem2})
        Me.MenuItem1.Text = "File"
        "
        "MenuItem2
        "
        Me.MenuItem2.Index = 0
        Me.MenuItem2.Text = "New..."
        "
        "MenuItem3
        "
        Me.MenuItem3.Index = 1
        Me.MenuItem3.MdiList = True
        Me.MenuItem3.Text = "Window"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.IsMdiContainer = True
        Me.Menu = Me.MainMenu1
        Me.Name = "Form1"
        Me.Text = "Form1"
    End Sub
#End Region
    Dim frmForm As Form2
    Private Sub MenuItem2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem2.Click
        frmForm = New Form2
        frmForm.Text = "New Document"
        frmForm.MdiParent = Me
        frmForm.Show()
    End Sub
End Class
Public Class Form2
    Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
    Public Sub New()
        MyBase.New()
        "This call is required by the Windows Form Designer.
        InitializeComponent()
        "Add any initialization after the InitializeComponent() call
    End Sub
    "Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents MenuItem1 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem2 As System.Windows.Forms.MenuItem
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.MainMenu1 = New System.Windows.Forms.MainMenu
        Me.MenuItem1 = New System.Windows.Forms.MenuItem
        Me.MenuItem2 = New System.Windows.Forms.MenuItem
        Me.SuspendLayout()
        "
        "TextBox1
        "
        Me.TextBox1.Dock = System.Windows.Forms.DockStyle.Fill
        Me.TextBox1.Location = New System.Drawing.Point(0, 0)
        Me.TextBox1.Multiline = True
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(184, 149)
        Me.TextBox1.TabIndex = 0
        Me.TextBox1.Text = ""
        "
        "MainMenu1
        "
        Me.MainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem1})
        "
        "MenuItem1
        "
        Me.MenuItem1.Index = 0
        Me.MenuItem1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem2})
        Me.MenuItem1.Text = "Edit"
        "
        "MenuItem2
        "
        Me.MenuItem2.Index = 0
        Me.MenuItem2.Text = "Auto Format"
        "
        "Form2
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(184, 149)
        Me.Controls.Add(Me.TextBox1)
        Me.Menu = Me.MainMenu1
        Me.Name = "Form2"
        Me.Text = "Form2"
        Me.ResumeLayout(False)
    End Sub
#End Region
End Class

RichText MDI Editor

Imports System.Windows.Forms
Imports System.Drawing.Text
Imports System.Drawing
Imports System.Drawing.Drawing2D
public class MDIRichTextBoxEditor
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class

Public Class Form2
    Inherits System.Windows.Forms.Form
    Public Sub New()
        MyBase.New()
        InitializeComponent()
    End Sub
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    Private components As System.ruponentModel.IContainer
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents ProgressBar1 As System.Windows.Forms.ProgressBar
    Friend WithEvents RichTextBox1 As System.Windows.Forms.RichTextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Label1 = New System.Windows.Forms.Label
        Me.ProgressBar1 = New System.Windows.Forms.ProgressBar
        Me.RichTextBox1 = New System.Windows.Forms.RichTextBox
        Me.SuspendLayout()
        "
        "Label1
        "
        Me.Label1.Location = New System.Drawing.Point(144, 201)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(80, 15)
        Me.Label1.TabIndex = 1
        Me.Label1.Text = "Label1"
        "
        "ProgressBar1
        "
        Me.ProgressBar1.Location = New System.Drawing.Point(48, 224)
        Me.ProgressBar1.Name = "ProgressBar1"
        Me.ProgressBar1.Size = New System.Drawing.Size(280, 24)
        Me.ProgressBar1.TabIndex = 2
        "
        "RichTextBox1
        "
        Me.RichTextBox1.Location = New System.Drawing.Point(32, 24)
        Me.RichTextBox1.Name = "RichTextBox1"
        Me.RichTextBox1.Size = New System.Drawing.Size(400, 224)
        Me.RichTextBox1.TabIndex = 3
        Me.RichTextBox1.Text = "RichTextBox1"
        "
        "Form2
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(8, 18)
        Me.ClientSize = New System.Drawing.Size(475, 272)
        Me.Controls.Add(Me.RichTextBox1)
        Me.Controls.Add(Me.ProgressBar1)
        Me.Controls.Add(Me.Label1)
        Me.Name = "Form2"
        Me.Text = "Form2"
        Me.ResumeLayout(False)
    End Sub

    Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    End Sub
    Private Sub Form2_Resize(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Resize
        RichTextBox1.Left = 0
        RichTextBox1.Top = 0
        RichTextBox1.Width = Me.ClientSize.Width
        RichTextBox1.Height = Me.ClientSize.Height
    End Sub
    Private Sub Form2_Closed(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Closed
        
    End Sub
    Private Sub Form2_FormClosed(ByVal sender As System.Object, ByVal e As System.Windows.Forms.FormClosedEventArgs) Handles MyBase.FormClosed
        " If Form1.DocNum > 1 Then
        " Form1.docnum = Form1.docnum - 1
        " Else : Form1.docnum = 0
        " End If
    End Sub
End Class
Public Class Form1
    Inherits System.Windows.Forms.Form
    Public Sub New()
        MyBase.New()
        InitializeComponent()
        Dim frmSplash As New Form2()
        frmSplash.Show()
        Dim i, j As Int64
        For i = 1 To 100
            For j = 1 To 1000000
            Next
            frmSplash.RichTextBox1.Visible = False
            frmSplash.Label1.Text = CStr(i)
            frmSplash.ProgressBar1.Value = i
            frmSplash.Refresh()
        Next
        frmSplash.Close()
    End Sub
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    Private components As System.ruponentModel.IContainer
    Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents MenuItem1 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem2 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem3 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem4 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem6 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem7 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem8 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem9 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem10 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem11 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem12 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem13 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem14 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem15 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem16 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem17 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem18 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem19 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem20 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem21 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem22 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem23 As System.Windows.Forms.MenuItem
    Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog
    Friend WithEvents SaveFileDialog1 As System.Windows.Forms.SaveFileDialog
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.ruponents = New System.ruponentModel.Container
        Me.MainMenu1 = New System.Windows.Forms.MainMenu(Me.ruponents)
        Me.MenuItem1 = New System.Windows.Forms.MenuItem
        Me.MenuItem2 = New System.Windows.Forms.MenuItem
        Me.MenuItem3 = New System.Windows.Forms.MenuItem
        Me.MenuItem4 = New System.Windows.Forms.MenuItem
        Me.MenuItem6 = New System.Windows.Forms.MenuItem
        Me.MenuItem7 = New System.Windows.Forms.MenuItem
        Me.MenuItem8 = New System.Windows.Forms.MenuItem
        Me.MenuItem9 = New System.Windows.Forms.MenuItem
        Me.MenuItem10 = New System.Windows.Forms.MenuItem
        Me.MenuItem11 = New System.Windows.Forms.MenuItem
        Me.MenuItem12 = New System.Windows.Forms.MenuItem
        Me.MenuItem13 = New System.Windows.Forms.MenuItem
        Me.MenuItem14 = New System.Windows.Forms.MenuItem
        Me.MenuItem15 = New System.Windows.Forms.MenuItem
        Me.MenuItem16 = New System.Windows.Forms.MenuItem
        Me.MenuItem17 = New System.Windows.Forms.MenuItem
        Me.MenuItem18 = New System.Windows.Forms.MenuItem
        Me.MenuItem19 = New System.Windows.Forms.MenuItem
        Me.MenuItem20 = New System.Windows.Forms.MenuItem
        Me.MenuItem21 = New System.Windows.Forms.MenuItem
        Me.MenuItem22 = New System.Windows.Forms.MenuItem
        Me.MenuItem23 = New System.Windows.Forms.MenuItem
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog
        Me.SaveFileDialog1 = New System.Windows.Forms.SaveFileDialog
        Me.SuspendLayout()
        "
        "MainMenu1
        "
        Me.MainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem1, Me.MenuItem9, Me.MenuItem17, Me.MenuItem23})
        "
        "MenuItem1
        "
        Me.MenuItem1.Index = 0
        Me.MenuItem1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem2, Me.MenuItem3, Me.MenuItem4, Me.MenuItem6, Me.MenuItem7, Me.MenuItem8})
        Me.MenuItem1.Text = "File"
        "
        "MenuItem2
        "
        Me.MenuItem2.Index = 0
        Me.MenuItem2.Text = "New"
        "
        "MenuItem3
        "
        Me.MenuItem3.Index = 1
        Me.MenuItem3.Text = "Open"
        "
        "MenuItem4
        "
        Me.MenuItem4.Index = 2
        Me.MenuItem4.Text = "Close"
        "
        "MenuItem6
        "
        Me.MenuItem6.Index = 3
        Me.MenuItem6.Text = "Save as"
        "
        "MenuItem7
        "
        Me.MenuItem7.Index = 4
        Me.MenuItem7.Text = "-"
        "
        "MenuItem8
        "
        Me.MenuItem8.Index = 5
        Me.MenuItem8.Text = "Quit"
        "
        "MenuItem9
        "
        Me.MenuItem9.Index = 1
        Me.MenuItem9.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem10, Me.MenuItem11, Me.MenuItem12, Me.MenuItem13, Me.MenuItem14, Me.MenuItem15, Me.MenuItem16})
        Me.MenuItem9.Text = "Edit"
        "
        "MenuItem10
        "
        Me.MenuItem10.Index = 0
        Me.MenuItem10.Text = "Restore"
        "
        "MenuItem11
        "
        Me.MenuItem11.Index = 1
        Me.MenuItem11.Text = "Select all"
        "
        "MenuItem12
        "
        Me.MenuItem12.Index = 2
        Me.MenuItem12.Text = "-"
        "
        "MenuItem13
        "
        Me.MenuItem13.Index = 3
        Me.MenuItem13.Text = "Cut"
        "
        "MenuItem14
        "
        Me.MenuItem14.Index = 4
        Me.MenuItem14.Text = "Copy"
        "
        "MenuItem15
        "
        Me.MenuItem15.Index = 5
        Me.MenuItem15.Text = "Pastr"
        "
        "MenuItem16
        "
        Me.MenuItem16.Index = 6
        Me.MenuItem16.Text = "Cut"
        "
        "MenuItem17
        "
        Me.MenuItem17.Index = 2
        Me.MenuItem17.MdiList = True
        Me.MenuItem17.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem18, Me.MenuItem19, Me.MenuItem20, Me.MenuItem21, Me.MenuItem22})
        Me.MenuItem17.Text = "Window"
        "
        "MenuItem18
        "
        Me.MenuItem18.Index = 0
        Me.MenuItem18.Text = "Cascade"
        "
        "MenuItem19
        "
        Me.MenuItem19.Index = 1
        Me.MenuItem19.Text = "Horizontal"
        "
        "MenuItem20
        "
        Me.MenuItem20.Index = 2
        Me.MenuItem20.Text = "Virtical"
        "
        "MenuItem21
        "
        Me.MenuItem21.Index = 3
        Me.MenuItem21.Text = "Arrange Icon"
        "
        "MenuItem22
        "
        Me.MenuItem22.Index = 4
        Me.MenuItem22.Text = "About"
        "
        "MenuItem23
        "
        Me.MenuItem23.Index = 3
        Me.MenuItem23.Text = ""
        "
        "SaveFileDialog1
        "
        Me.SaveFileDialog1.FileName = "doc1"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(8, 18)
        Me.ClientSize = New System.Drawing.Size(428, 187)
        Me.IsMdiContainer = True
        Me.Menu = Me.MainMenu1
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)
    End Sub
    Public docnum As Integer
    Private Sub MenuItem18_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem18.Click
        Me.LayoutMdi(System.Windows.Forms.MdiLayout.Cascade)
    End Sub
    Private Sub MenuItem22_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem22.Click
        Dim formabout As New Form2()
        formabout.ProgressBar1.Visible = False
        formabout.RichTextBox1.Visible = False
        formabout.Label1.Text = "Welcome"
        formabout.ShowDialog()
        formabout.Dispose()
    End Sub
    Private Sub MenuItem2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem2.Click
        Dim NewMDIChild As New Form2()
        docnum = docnum + 1
        NewMDIChild.Text = "MDI " & docnum
        NewMDIChild.MdiParent = Me
        NewMDIChild.Show()
    End Sub
    Private Sub MenuItem4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem4.Click
        Dim activechild As Form = Me.ActiveMdiChild
        If (Not activechild Is Nothing) Then
            activechild.Close()
        End If
    End Sub
    Private Sub MenuItem3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem3.Click
        Dim fileName As String
        OpenFileDialog1.InitialDirectory = "c:\"
        OpenFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*"
        OpenFileDialog1.FilterIndex = 2
        OpenFileDialog1.RestoreDirectory = True
        If OpenFileDialog1.ShowDialog() = DialogResult.OK Then
            fileName = OpenFileDialog1.FileName
        End If
        If fileName = "" Then Exit Sub
        Dim NewMDIChild As New Form2()
        docnum = docnum + 1
        NewMDIChild.MdiParent = Me
        NewMDIChild.Text = fileName
        NewMDIChild.RichTextBox1.LoadFile(fileName, RichTextBoxStreamType.PlainText)
        NewMDIChild.Show()
    End Sub
    Private Sub MenuItem19_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem19.Click
        Me.LayoutMdi(System.Windows.Forms.MdiLayout.TileHorizontal)
    End Sub
    Private Sub MenuItem20_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem20.Click
        Me.LayoutMdi(System.Windows.Forms.MdiLayout.TileVertical)
    End Sub
    Private Sub MenuItem21_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem21.Click
        Me.LayoutMdi(System.Windows.Forms.MdiLayout.ArrangeIcons)
    End Sub
    Private Sub MenuItem14_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem14.Click
        Dim activechild As Form = Me.ActiveMdiChild
        If (Not activechild Is Nothing) Then
            Try
                Dim theBox As RichTextBox
                theBox = CType(activechild.ActiveControl, RichTextBox)
                If (Not theBox Is Nothing) Then
                    Clipboard.SetDataObject(theBox.SelectedText)
                End If
            Catch
                MessageBox.Show("No selected RichTextBox")
            End Try
        End If
    End Sub
    Private Sub MenuItem15_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem15.Click
        Dim activeChild As Form
        activeChild = Me.ActiveMdiChild
        If (Not activeChild Is Nothing) Then
            Try
                Dim theBox As RichTextBox
                theBox = CType(activeChild.ActiveControl, RichTextBox)
                If (Not theBox Is Nothing) Then
                    Dim data As IDataObject
                    data = Clipboard.GetDataObject()
                    If (data.GetDataPresent(DataFormats.Text)) Then
                        theBox.SelectedText = data.GetData(DataFormats.Text).ToString()
                    End If
                End If
            Catch
                MessageBox.Show("NO RichTextBox selected")
            End Try
        End If
    End Sub
    Private Sub MenuItem13_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem13.Click
        Dim activechild As Form = Me.ActiveMdiChild
        If (Not activechild Is Nothing) Then
            Try
                Dim theBox As RichTextBox
                theBox = CType(activechild.ActiveControl, RichTextBox)
                If (Not theBox Is Nothing) Then
                    Clipboard.SetDataObject(theBox.SelectedText)
                    theBox.SelectedText = ""
                End If
            Catch
                MessageBox.Show("No RichTextBox selected ")
            End Try
        End If
    End Sub
    Private Sub MenuItem6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem6.Click
        Dim fileName As String
        SaveFileDialog1.InitialDirectory = "c:\"
        SaveFileDialog1.DefaultExt = "*.txt"
        SaveFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*"
        SaveFileDialog1.FilterIndex = 1
        SaveFileDialog1.RestoreDirectory = True
        If SaveFileDialog1.ShowDialog() = DialogResult.OK Then
            fileName = SaveFileDialog1.FileName
        End If
        If fileName = "" Then Exit Sub
        Dim activeChild As Form
        activeChild = Me.ActiveMdiChild
        If (Not activeChild Is Nothing) Then
            Try
                Dim theBox As RichTextBox
                theBox = CType(activeChild.ActiveControl, RichTextBox)
                If (Not theBox Is Nothing) Then
                    theBox.SaveFile(fileName, RichTextBoxStreamType.PlainText)
                End If
            Catch
                MessageBox.Show("No RichTextBox selected ")
            End Try
        End If
    End Sub
    Private Sub MenuItem11_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem11.Click
        Dim activechild As Form = Me.ActiveMdiChild
        If (Not activechild Is Nothing) Then
            Try
                Dim theBox As RichTextBox
                theBox = CType(activechild.ActiveControl, RichTextBox)
                If (Not theBox Is Nothing) Then
                    theBox.SelectAll()
                End If
            Catch
                MessageBox.Show("No RichTextBox selected ")
            End Try
        End If
    End Sub
    Private Sub MenuItem10_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem10.Click
        Dim activechild As Form = Me.ActiveMdiChild
        If (Not activechild Is Nothing) Then
            Try
                Dim theBox As RichTextBox
                theBox = CType(activechild.ActiveControl, RichTextBox)
                If (Not theBox Is Nothing) Then
                    theBox.Undo()
                End If
            Catch
                MessageBox.Show("No RichTextBox selected ")
            End Try
        End If
    End Sub
    Private Sub MenuItem16_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem16.Click
        Dim activechild As Form = Me.ActiveMdiChild
        If (Not activechild Is Nothing) Then
            Try
                Dim theBox As RichTextBox
                theBox = CType(activechild.ActiveControl, RichTextBox)
                If (Not theBox Is Nothing) Then
                    theBox.SelectedText = ""
                End If
            Catch
                MessageBox.Show("No RichTextBox selected")
            End Try
        End If
    End Sub
    Private Sub MenuItem8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem8.Click
        Close()
    End Sub
End Class

Use a tree to manage MDI Child window

Imports System.Windows.Forms
public class ParentFormMDI
   public Shared Sub Main
        Application.Run(New ParentForm)
   End Sub
End class

Public Class ParentForm
    Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
    Public Sub New()
        MyBase.New()
        "This call is required by the Windows Form Designer.
        InitializeComponent()
        "Add any initialization after the InitializeComponent() call
    End Sub
    "Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    Friend WithEvents cmdCascade As System.Windows.Forms.MenuItem
    Friend WithEvents menuItem7 As System.Windows.Forms.MenuItem
    Friend WithEvents menuItem3 As System.Windows.Forms.MenuItem
    Friend WithEvents cmdWindowArrangeIcons As System.Windows.Forms.MenuItem
    Friend WithEvents cmdWindowTileChildrenVert As System.Windows.Forms.MenuItem
    Friend WithEvents cmdWindowTileChildrenHoriz As System.Windows.Forms.MenuItem
    Friend WithEvents menuItem8 As System.Windows.Forms.MenuItem
    Friend WithEvents statusBar1 As System.Windows.Forms.StatusBar
    Friend WithEvents cmdFileNewChild As System.Windows.Forms.MenuItem
    Friend WithEvents cmdFileExit As System.Windows.Forms.MenuItem
    Friend WithEvents treeView1 As System.Windows.Forms.TreeView
    Friend WithEvents mainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents menuItem1 As System.Windows.Forms.MenuItem
    Friend WithEvents menuItem9 As System.Windows.Forms.MenuItem
    Friend WithEvents splitter1 As System.Windows.Forms.Splitter
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.cmdCascade = New System.Windows.Forms.MenuItem()
        Me.menuItem7 = New System.Windows.Forms.MenuItem()
        Me.menuItem3 = New System.Windows.Forms.MenuItem()
        Me.cmdWindowArrangeIcons = New System.Windows.Forms.MenuItem()
        Me.cmdWindowTileChildrenVert = New System.Windows.Forms.MenuItem()
        Me.cmdWindowTileChildrenHoriz = New System.Windows.Forms.MenuItem()
        Me.menuItem8 = New System.Windows.Forms.MenuItem()
        Me.statusBar1 = New System.Windows.Forms.StatusBar()
        Me.cmdFileNewChild = New System.Windows.Forms.MenuItem()
        Me.cmdFileExit = New System.Windows.Forms.MenuItem()
        Me.treeView1 = New System.Windows.Forms.TreeView()
        Me.mainMenu1 = New System.Windows.Forms.MainMenu()
        Me.menuItem1 = New System.Windows.Forms.MenuItem()
        Me.menuItem9 = New System.Windows.Forms.MenuItem()
        Me.splitter1 = New System.Windows.Forms.Splitter()
        Me.SuspendLayout()
        "
        "cmdCascade
        "
        Me.cmdCascade.Index = 1
        Me.cmdCascade.Text = "&Cascade"
        "
        "menuItem7
        "
        Me.menuItem7.Index = 4
        Me.menuItem7.Text = "-"
        "
        "menuItem3
        "
        Me.menuItem3.Index = 1
        Me.menuItem3.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.cmdWindowArrangeIcons, Me.cmdCascade, Me.cmdWindowTileChildrenVert, Me.cmdWindowTileChildrenHoriz, Me.menuItem7, Me.menuItem8})
        Me.menuItem3.MergeOrder = 2
        Me.menuItem3.Text = "&Window"
        "
        "cmdWindowArrangeIcons
        "
        Me.cmdWindowArrangeIcons.Index = 0
        Me.cmdWindowArrangeIcons.Text = "&Arrange Icons"
        "
        "cmdWindowTileChildrenVert
        "
        Me.cmdWindowTileChildrenVert.Index = 2
        Me.cmdWindowTileChildrenVert.Text = "Tile Children &Vertically"
        "
        "cmdWindowTileChildrenHoriz
        "
        Me.cmdWindowTileChildrenHoriz.Index = 3
        Me.cmdWindowTileChildrenHoriz.Text = "Tile Children &Horizontally"
        "
        "menuItem8
        "
        Me.menuItem8.Index = 5
        Me.menuItem8.MdiList = True
        Me.menuItem8.Text = "Window&s"
        "
        "statusBar1
        "
        Me.statusBar1.Location = New System.Drawing.Point(0, 179)
        Me.statusBar1.Name = "statusBar1"
        Me.statusBar1.Size = New System.Drawing.Size(352, 22)
        Me.statusBar1.TabIndex = 4
        Me.statusBar1.Text = "Ready"
        "
        "cmdFileNewChild
        "
        Me.cmdFileNewChild.Index = 0
        Me.cmdFileNewChild.Shortcut = System.Windows.Forms.Shortcut.CtrlN
        Me.cmdFileNewChild.Text = "&New Child"
        "
        "cmdFileExit
        "
        Me.cmdFileExit.Index = 2
        Me.cmdFileExit.MergeOrder = 2
        Me.cmdFileExit.Text = "E&xit"
        "
        "treeView1
        "
        Me.treeView1.Dock = System.Windows.Forms.DockStyle.Left
        Me.treeView1.ImageIndex = -1
        Me.treeView1.Location = New System.Drawing.Point(3, 0)
        Me.treeView1.Name = "treeView1"
        Me.treeView1.Nodes.AddRange(New System.Windows.Forms.TreeNode() {New System.Windows.Forms.TreeNode("Children")})
        Me.treeView1.SelectedImageIndex = -1
        Me.treeView1.Size = New System.Drawing.Size(121, 179)
        Me.treeView1.TabIndex = 5
        "
        "mainMenu1
        "
        Me.mainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.menuItem1, Me.menuItem3})
        "
        "menuItem1
        "
        Me.menuItem1.Index = 0
        Me.menuItem1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.cmdFileNewChild, Me.menuItem9, Me.cmdFileExit})
        Me.menuItem1.MergeType = System.Windows.Forms.MenuMerge.MergeItems
        Me.menuItem1.Text = "&File"
        "
        "menuItem9
        "
        Me.menuItem9.Index = 1
        Me.menuItem9.MergeOrder = 2
        Me.menuItem9.Text = "-"
        "
        "splitter1
        "
        Me.splitter1.Name = "splitter1"
        Me.splitter1.Size = New System.Drawing.Size(3, 179)
        Me.splitter1.TabIndex = 6
        Me.splitter1.TabStop = False
        "
        "ParentForm
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(352, 201)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.treeView1, Me.splitter1, Me.statusBar1})
        Me.IsMdiContainer = True
        Me.Menu = Me.mainMenu1
        Me.Name = "ParentForm"
        Me.Text = "MDI Parent"
        Me.ResumeLayout(False)
    End Sub
#End Region
    Dim nextChild As Integer = 1

    Public Sub ChildClosed(ByVal sender As Object, ByVal e As EventArgs)
        Dim node As TreeNode
        For Each node In treeView1.Nodes(0).Nodes
            If node.Tag Is sender Then
                treeView1.Nodes(0).Nodes.Remove(node)
                Exit For
            End If
        Next
    End Sub
    Private Sub cmdFileNewChild_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdFileNewChild.Click
        Dim child As Form = New ChildForm()
        child.Text = "Child " & nextChild.ToString()
        AddHandler child.Closed, AddressOf ChildClosed
        nextChild = nextChild + 1
        child.MdiParent = Me
        child.Show()
        Dim node As TreeNode = New TreeNode(child.Text)
        node.Tag = child
        treeView1.Nodes(0).Nodes.Add(node)
        treeView1.Nodes(0).Expand()
    End Sub
    Private Sub cmdFileExit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdFileExit.Click
        Close()
    End Sub
    Private Sub treeView1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles treeView1.Click
        Dim child As Form
        If TypeOf (treeView1.SelectedNode.Tag) Is Form Then
            child = CType(treeView1.SelectedNode.Tag, Form)
        End If
        If Not child Is Nothing Then child.Activate()
    End Sub
End Class

Public Class ChildForm
    Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
    Public Sub New()
        MyBase.New()
        "This call is required by the Windows Form Designer.
        InitializeComponent()
        "Add any initialization after the InitializeComponent() call
    End Sub
    "Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    Friend WithEvents mainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents menuItem11 As System.Windows.Forms.MenuItem
    Friend WithEvents menuItem1 As System.Windows.Forms.MenuItem
    Friend WithEvents cmdFileClose As System.Windows.Forms.MenuItem
    Friend WithEvents menuItem13 As System.Windows.Forms.MenuItem
    Friend WithEvents menuItem5 As System.Windows.Forms.MenuItem
    Friend WithEvents menuItem4 As System.Windows.Forms.MenuItem
    Friend WithEvents menuItem6 As System.Windows.Forms.MenuItem
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.mainMenu1 = New System.Windows.Forms.MainMenu()
        Me.menuItem11 = New System.Windows.Forms.MenuItem()
        Me.menuItem1 = New System.Windows.Forms.MenuItem()
        Me.cmdFileClose = New System.Windows.Forms.MenuItem()
        Me.menuItem13 = New System.Windows.Forms.MenuItem()
        Me.menuItem5 = New System.Windows.Forms.MenuItem()
        Me.menuItem4 = New System.Windows.Forms.MenuItem()
        Me.menuItem6 = New System.Windows.Forms.MenuItem()
        "
        "mainMenu1
        "
        Me.mainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.menuItem11, Me.menuItem13})
        "
        "menuItem11
        "
        Me.menuItem11.Index = 0
        Me.menuItem11.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.menuItem1, Me.cmdFileClose})
        Me.menuItem11.MergeType = System.Windows.Forms.MenuMerge.MergeItems
        Me.menuItem11.Text = "&File"
        "
        "menuItem1
        "
        Me.menuItem1.Index = 0
        Me.menuItem1.MergeOrder = 1
        Me.menuItem1.Text = "&Save"
        "
        "cmdFileClose
        "
        Me.cmdFileClose.Index = 1
        Me.cmdFileClose.MergeOrder = 1
        Me.cmdFileClose.Text = "&Close"
        "
        "menuItem13
        "
        Me.menuItem13.Index = 1
        Me.menuItem13.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.menuItem5, Me.menuItem4, Me.menuItem6})
        Me.menuItem13.MergeOrder = 1
        Me.menuItem13.Text = "&Edit"
        "
        "menuItem5
        "
        Me.menuItem5.Index = 0
        Me.menuItem5.Text = "Cu&t"
        "
        "menuItem4
        "
        Me.menuItem4.Index = 1
        Me.menuItem4.Text = "&Copy"
        "
        "menuItem6
        "
        Me.menuItem6.Index = 2
        Me.menuItem6.Text = "&Paste"
        "
        "ChildForm
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(168, 147)
        Me.Menu = Me.mainMenu1
        Me.Name = "ChildForm"
        Me.Text = "MDI Child"
    End Sub
#End Region
    Private Sub cmdFileClose_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdFileClose.Click
        Close()
    End Sub
End Class