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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.cs using System; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Navigation; using System.Windows.Shapes; using System.Windows.Data; using System.Windows.Input; namespace ElemCollMethods {   public partial class Pane1 : Page   {     System.Windows.Controls.Button btn, btn1, btn2, btn3;         void ContainsElement(object sender, RoutedEventArgs e)         {             sp1.Children.Clear();             btn = new Button();       btn.Content = "Click to clear";             sp1.Children.Add(btn);             btn.Click += (ClearControls);       btn1 = new Button();       btn1.Content = "Click to clear";             sp1.Children.Add(btn1);             btn1.Click += (ClearControls);       btn2 = new Button();       btn2.Content = "Click to clear";             sp1.Children.Add(btn2);             btn2.Click += (ClearControls);       btn3 = new Button();       btn3.Content = "Click to clear";             sp1.Children.Add(btn3);             btn3.Click += (ClearControls);             TextBlock txt1 = new TextBlock();             sp1.Children.Add(txt1);             txt1.Text = "This StackPanel contains UIElement btn1: " + sp1.Children.Contains(btn1).ToString();         }              void ClearControls(object sender, RoutedEventArgs e)     {             sp1.Children.Clear();         }           } }