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<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         x:Class="AboutDialog" MouseRightButtonDown="AboutDialog_MouseRightButtonDown"         Title="About WPF Unleashed" SizeToContent="WidthAndHeight"         Background="OrangeRed">   <StackPanel>     <Label FontWeight="Bold" FontSize="20" Foreground="White">       WPF     </Label>     <Label>License</Label>     <Label>Installed Dll:</Label>     <ListBox>       <ListBoxItem>1</ListBoxItem>       <ListBoxItem>2</ListBoxItem>       <ListBoxItem>3</ListBoxItem>       <ListBoxItem>4</ListBoxItem>       <ListBoxItem>5</ListBoxItem>       <ListBoxItem>6</ListBoxItem>       <ListBoxItem>7</ListBoxItem>       <ListBoxItem>8</ListBoxItem>       <ListBoxItem>9</ListBoxItem>            </ListBox>     <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">       <Button MinWidth="75" Margin="10">Help</Button>       <Button MinWidth="75" Margin="10">OK</Button>     </StackPanel>     <StatusBar>test</StatusBar>   </StackPanel> </Window> //File:Window.xaml.cs using System; using System.Windows; using System.Windows.Input; using System.Windows.Media; using System.Windows.Controls; public partial class AboutDialog : Window {     public AboutDialog()     {         InitializeComponent();     }     void AboutDialog_MouseRightButtonDown(object sender, MouseButtonEventArgs e)     {         Console.WriteLine("Source = " + e.Source.GetType().Name);         Console.WriteLine("OriginalSource = " + e.OriginalSource.GetType().Name + " @ " + e.Timestamp);         Control source = e.Source as Control;         if (source.BorderThickness != new Thickness(5))         {             source.BorderThickness = new Thickness(5);             source.BorderBrush = Brushes.Black;         }         else             source.BorderThickness = new Thickness(0);     } }