Changing graphical elements : UI Element « Windows Presentation Foundation « VB.Net Tutorial

1. VB.Net Tutorial
2. Windows Presentation Foundation
3. UI Element

<Window x:Class="ChangeItem.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Change Item">

  <Canvas x:Name="mainCanvas">
    <Ellipse Canvas.Left="10" Canvas.Top="30" Fill="Indigo" Width="40" Height="20" />
    <Ellipse Canvas.Left="20" Canvas.Top="40" Fill="Blue" Width="40" Height="20" />
    <Ellipse Canvas.Left="30" Canvas.Top="50" Fill="Cyan" Width="40" Height="20" />
    <Ellipse Canvas.Left="40" Canvas.Top="60" Fill="LightGreen" Width="40" Height="20" />
    <Ellipse Canvas.Left="50" Canvas.Top="70" Fill="Yellow" Width="40" Height="20" />
  </Canvas>
</Window>
//File:Window.xaml.vb
Imports System.Windows
Imports System.Windows.Shapes

Namespace ChangeItem
  Public Partial Class MainWindow
    Inherits Window
    Public Sub New()
      MyBase.New()
      InitializeComponent()
      AddHandler mainCanvas.MouseLeftButtonDown, AddressOf OnClick
    End Sub

    Private Sub OnClick(sender As Object, e As RoutedEventArgs)
      Dim r As Ellipse = TryCast(e.Source, Ellipse)
      If r IsNot Nothing Then
        r.Width += 10
      End If
    End Sub
  End Class
End Namespace

16.50.UI Element
	16.50.1.	Find enclosure component
	16.50.2.	Clear locally set values and restore the default values of dependency properties
	16.50.3.	PresentationTraceSources.SetTraceLevel(binding,PresentationTraceLevel.High);
	16.50.4.	UI Element Mouse Clicked Events
	16.50.5.	Programmatically Extract an Element's Style with DefaultStyleKeyProperty
	16.50.6.	Print Logical Tree
	16.50.7.	Print Visual Tree
	16.50.8.	About Dialog with Tree Walking
	16.50.9.	Changing graphical elements
	16.50.10.	UIElement Count
	16.50.11.	Use Linq to get control from a container
	16.50.12.	Find inner visual element
	16.50.13.	Logical Visual Tree Sample
	16.50.14.	Point Hit Test with VisualTreeHelper.HitTest
	16.50.15.	Change the Visibility property of a UIElement.
	16.50.16.	Mixing graphics with Control Elements