Use ControlTemplate and event handler : ControlTemplate « Windows Presentation Foundation « VB.Net Tutorial

1. VB.Net Tutorial
2. Windows Presentation Foundation
3. ControlTemplate

<Window x:Class="ControlTemplate.Window1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="ControlTemplate" Height="300" Width="300">
  <Window.Resources>
    <ControlTemplate x:Key="customizeButton" TargetType="{x:Type Button}">
      <Grid>
        <Ellipse Width="100" Height="100" Fill="Green" 
          Stroke="Red" StrokeThickness="2"/>
        <ContentPresenter VerticalAlignment="Center"
          HorizontalAlignment="Center"></ContentPresenter>
      </Grid>
    </ControlTemplate>
  </Window.Resources>
  <Grid HorizontalAlignment="Center" VerticalAlignment="Center">
    <Button Name="button1" Template="{StaticResource customizeButton}"  
      Foreground="White" Click="button1_Click">Press Me!</Button>
  </Grid>
</Window>

//File:Window.xaml.vb
Imports System
Imports System.Collections.Generic
Imports System.Text
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Data
Imports System.Windows.Documents
Imports System.Windows.Input
Imports System.Windows.Media
Imports System.Windows.Media.Imaging
Imports System.Windows.Shapes


Namespace ControlTemplate
  Public Partial Class Window1
    Inherits System.Windows.Window

    Public Sub New()
      InitializeComponent()
    End Sub

    Private Sub button1_Click(sender As Object, e As RoutedEventArgs)
      MessageBox.Show("Hello WPF!")
    End Sub

  End Class
End Namespace

16.106.ControlTemplate
	16.106.1.	Button With Template: change border
	16.106.2.	Create a Control Template
	16.106.3.	Create a Control Template That Can Be Customized by Properties
	16.106.4.	Use ControlTemplate and event handler
	16.106.5.	Finding the border that is generated by the ControlTemplate of the Button
	16.106.6.	Get The actual width of the border in the ControlTemplate
	16.106.7.	ControlTemplates and style xaml file
	16.106.8.	Use a ContentTemplate and determine whether the control contains content.
	16.106.9.	Enhance the visual appearance of a ContentControl by applying a style.