Contains Element? : Xaml « Windows Presentation Foundation « VB.Net

1. VB.Net
2. Windows Presentation Foundation
3. Xaml

Contains Element?

     
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="ElemCollMethods.Pane1"
    WindowTitle="UI Element Collection Methods Sample">
 <StackPanel>
    <TextBlock Name="txt" FontSize="16">UI Element Collection - Methods</TextBlock>

    <TabControl>
        <TabItem MouseLeftButtonUp="ContainsElement">
            <TabItem.Header>Contains Element?</TabItem.Header>
        </TabItem>
    </TabControl>
    <StackPanel Name="sp1"></StackPanel>

 </StackPanel>
</Page>
//File:Window.xaml.vb

Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Documents
Imports System.Windows.Navigation
Imports System.Windows.Shapes
Imports System.Windows.Data
Imports System.Windows.Input

Namespace ElemCollMethods

  Public Partial Class Pane1
    Inherits Page
    Private btn As System.Windows.Controls.Button, btn1 As System.Windows.Controls.Button, btn2 As System.Windows.Controls.Button, btn3 As System.Windows.Controls.Button

    Private Sub ContainsElement(sender As Object, e As RoutedEventArgs)
      sp1.Children.Clear()
      btn = New Button()
      btn.Content = "Click to clear"
      sp1.Children.Add(btn)
      AddHandler btn.Click, (AddressOf ClearControls)
      btn1 = New Button()
      btn1.Content = "Click to clear"
      sp1.Children.Add(btn1)
      AddHandler btn1.Click, (AddressOf ClearControls)
      btn2 = New Button()
      btn2.Content = "Click to clear"
      sp1.Children.Add(btn2)
      AddHandler btn2.Click, (AddressOf ClearControls)
      btn3 = New Button()
      btn3.Content = "Click to clear"
      sp1.Children.Add(btn3)
      AddHandler btn3.Click, (AddressOf ClearControls)

      Dim txt1 As New TextBlock()
      sp1.Children.Add(txt1)
      txt1.Text = "This StackPanel contains UIElement btn1: " + sp1.Children.Contains(btn1).ToString()
    End Sub

    Private Sub ClearControls(sender As Object, e As RoutedEventArgs)
      sp1.Children.Clear()
    End Sub
  End Class
End Namespace

   
    
    
    
    
  

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