VB.Net/GUI/Control Subclass

Sub class Button class to create a Clock button

Imports System
Imports System.Collections
Imports System.Data
Imports System.IO
Imports System.Xml.Serialization
Imports System.Xml
Imports System.Windows.Forms
Imports System.Data.SqlClient
Imports System.Data.OleDb
Public Class MainClass
    Shared Sub Main()
        Dim form1 As Form = New Form1
        Application.Run(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 TickButton1 As TickButton
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.TickButton1 = New TickButton()
        Me.SuspendLayout()
        "
        "TickButton1
        "
        Me.TickButton1.Location = New System.Drawing.Point(16, 120)
        Me.TickButton1.Name = "TickButton1"
        Me.TickButton1.Size = New System.Drawing.Size(216, 23)
        Me.TickButton1.TabIndex = 4
        Me.TickButton1.Text = "Design Mode"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(240, 189)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.TickButton1})
        Me.Name = "Form1"
        Me.ResumeLayout(False)
    End Sub
#End Region
End Class


Public Class TickButton
    Inherits System.Windows.Forms.Button

#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
    "UserControl 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 ticker As System.Windows.Forms.Timer
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.ruponents = New System.ruponentModel.Container()
        Me.ticker = New System.Windows.Forms.Timer(Me.ruponents)
        "
        "ticker
        "
    End Sub
#End Region
    Protected Overrides Sub InitLayout()
        " are we in design mode?
        If DesignMode = True Then
            Text = "Design Mode"
        Else
            ticker.Enabled = True
        End If
    End Sub
    Private Sub ticker_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ticker.Tick
        " update the text...
        Text = Now.ToString
    End Sub
End Class

Subclass Form

Imports System
Imports System.Drawing
Imports System.Windows.Forms
Imports System.ruponentModel
Imports System.Drawing.Drawing2D
Imports System.IO
Public Class MainClass
    
    Shared Sub Main()
        Dim form1 As Form = New Form1
        Application.Run(form1)

    End Sub
End Class


Public Class Form1
    Inherits Ancestor
#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()
        Me.SuspendLayout()
        "
        "Descendent
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 14)
        Me.ClientSize = New System.Drawing.Size(300, 266)
        Me.HeaderText = "HeaderText"
        Me.Name = "Descendent"
        Me.ResumeLayout(False)
    End Sub
#End Region
    " Do NOT include the Handles keyword!
    Protected Overrides Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
        MessageBox.Show("derived")
    End Sub

End Class

Public Class Ancestor
    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 Panel1 As System.Windows.Forms.Panel
    Friend WithEvents lblHeader As System.Windows.Forms.Label
    Friend WithEvents cmdNext As System.Windows.Forms.Button
    Friend WithEvents GroupBox1 As System.Windows.Forms.GroupBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Panel1 = New System.Windows.Forms.Panel()
        Me.lblHeader = New System.Windows.Forms.Label()
        Me.cmdNext = New System.Windows.Forms.Button()
        Me.GroupBox1 = New System.Windows.Forms.GroupBox()
        Me.Panel1.SuspendLayout()
        Me.SuspendLayout()
        "
        "Panel1
        "
        Me.Panel1.Anchor = ((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right)
        Me.Panel1.BackColor = System.Drawing.Color.White
        Me.Panel1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
        Me.Panel1.Controls.AddRange(New System.Windows.Forms.Control() {Me.lblHeader})
        Me.Panel1.Location = New System.Drawing.Point(4, 4)
        Me.Panel1.Name = "Panel1"
        Me.Panel1.Size = New System.Drawing.Size(292, 68)
        Me.Panel1.TabIndex = 0
        "
        "lblHeader
        "
        Me.lblHeader.Anchor = ((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right)
        Me.lblHeader.Font = New System.Drawing.Font("Tahoma", 8.25!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.lblHeader.Location = New System.Drawing.Point(16, 16)
        Me.lblHeader.Name = "lblHeader"
        Me.lblHeader.Size = New System.Drawing.Size(262, 28)
        Me.lblHeader.TabIndex = 0
        Me.lblHeader.Text = "Header Text"
        "
        "cmdNext
        "
        Me.cmdNext.Anchor = (System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Right)
        Me.cmdNext.FlatStyle = System.Windows.Forms.FlatStyle.System
        Me.cmdNext.Location = New System.Drawing.Point(232, 232)
        Me.cmdNext.Name = "cmdNext"
        Me.cmdNext.Size = New System.Drawing.Size(60, 28)
        Me.cmdNext.TabIndex = 1
        Me.cmdNext.Text = "Next"
        "
        "GroupBox1
        "
        Me.GroupBox1.Anchor = ((System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right)
        Me.GroupBox1.Location = New System.Drawing.Point(8, 224)
        Me.GroupBox1.Name = "GroupBox1"
        Me.GroupBox1.Size = New System.Drawing.Size(284, 4)
        Me.GroupBox1.TabIndex = 2
        Me.GroupBox1.TabStop = False
        Me.GroupBox1.Text = "GroupBox1"
        "
        "Ancestor
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 14)
        Me.ClientSize = New System.Drawing.Size(300, 266)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.GroupBox1, Me.cmdNext, Me.Panel1})
        Me.Font = New System.Drawing.Font("Tahoma", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Name = "Ancestor"
        Me.Text = "Ancestor"
        Me.Panel1.ResumeLayout(False)
        Me.ResumeLayout(False)
    End Sub
#End Region
    Protected Overridable Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdNext.Click
    End Sub
    Public Property HeaderText() As String
        Get
            Return lblHeader.Text
        End Get
        Set(ByVal Value As String)
            lblHeader.Text = Value
        End Set
    End Property
    
End Class