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Add a control 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="AddButton">             <TabItem.Header>Add 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 AddButton(object sender, MouseButtonEventArgs e)     {       sp1.Children.Clear();       btn = new Button();       btn.Content = "New Button";       sp1.Children.Add(btn);     }   } }