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Insert Button to a Panel

<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="InsertButton">             <TabItem.Header>Insert Control</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 InsertButton(object sender, MouseButtonEventArgs e)     {             sp1.Children.Clear();             btn = new Button();       btn.Content = "Click to insert button";             sp1.Children.Add(btn);             btn.Click += (InsertControls);       btn1 = new Button();       btn1.Content = "Click to insert button";             sp1.Children.Add(btn1);             btn1.Click += (InsertControls);     }     void InsertControls(object sender, RoutedEventArgs e)     {       btn2 = new Button();       btn2.Content = "Inserted Button";             sp1.Children.Insert(1, btn2);         }   } }