<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(); } } }