VB.Net/Event/Focus

Focus event Demo: Button lost focus

Imports System
Imports System.Collections
Imports System.ruponentModel
Imports System.Windows.Forms
Imports System.Data
Imports System.Configuration
Imports System.Resources
Imports System.Drawing
Imports System.Drawing.Drawing2D

Public Class MainClass
    Shared Sub Main()
        Dim myform As Form = New Form1()
        Application.Run(myform)
    End Sub
End Class
Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button1.Click
        "Display a MessageBox
        MessageBox.Show("The MouseUp event has been fired.", "Info")
    End Sub
    Private Sub Button1_LostFocus(ByVal sender As Object, _
        ByVal e As System.EventArgs) Handles Button1.LostFocus
        "Display a MessageBox
        MessageBox.Show("Button1 has lost focus.", "Info")
    End Sub
End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads 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.Button2 = New System.Windows.Forms.Button
        Me.Button1 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        "
        "Button2
        "
        Me.Button2.Location = New System.Drawing.Point(136, 33)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(93, 23)
        Me.Button2.TabIndex = 3
        Me.Button2.Text = "Button2"
        "
        "Button1
        "
        Me.Button1.Location = New System.Drawing.Point(24, 33)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(93, 23)
        Me.Button1.TabIndex = 2
        Me.Button1.Text = "Mouse Events"
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(253, 89)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.Button1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)
    End Sub
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents Button1 As System.Windows.Forms.Button
End Class