<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); } } }