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Find source element of an element in event handler by casint

<StackPanel   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   x:Class="WpfApplication1.RoutedEventSource">   <StackPanel.Resources>     <Style TargetType ="{x:Type Button}">       <Setter Property="Height" Value="30"/>       <Setter Property="Width" Value="100"/>       <Setter Property="HorizontalAlignment" Value="Left"/>     </Style>   </StackPanel.Resources>   <Button Click="HandleClick">Button 1</Button>   <Button Click="HandleClick">Button 2</Button>   <Button Click="HandleClick">Button 3</Button>     </StackPanel> //File:Window.xaml.cs using System.Windows; using System.Windows.Controls; namespace WpfApplication1 {     public partial class RoutedEventSource {         void HandleClick(object sender, RoutedEventArgs e)         {             Button srcButton = e.Source as Button;       srcButton.Width = 200;         }     } }