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Grid MouseLeftButtonDown action and PreviewMouseLeftButtonDown action

<Window x:Class="TunnelingBubbling.Window1"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="TunnelingBubbling">        <Grid MouseLeftButtonDown="MouseDownGrid"           PreviewMouseLeftButtonDown="PreviewMouseDownGrid"       Width="300" Height="300">     <Button PreviewMouseLeftButtonDown="PreviewMouseDownButton"       MouseLeftButtonDown="MouseDownButton"       Click="MyClickEvent"       Name="btnGo">       <TextBox MouseLeftButtonDown="MouseLeftButtonDown"         PreviewMouseLeftButtonDown="PreviewMouseLeftButtonDown"         Width="200" Height="30" Name="textBox1">       </TextBox>     </Button>   </Grid>   </Window> //File:Window.xaml.cs using System; using System.Collections.Generic; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Shapes; using System.Diagnostics; namespace TunnelingBubbling {     public partial class Window1 : System.Windows.Window     {         public Window1()         {             InitializeComponent();         }         private void PreviewMouseDownGrid(object sender, RoutedEventArgs e)         {             Debug.WriteLine("PreviewMouseDownGrid");         }         private void PreviewMouseDownButton(object sender, RoutedEventArgs e)         {             Debug.WriteLine("PreviewMouseDownButton");         }         private void PreviewMouseLeftButtonDown(object sender, RoutedEventArgs e)         {             Debug.WriteLine("PreviewMouseLeftButtonDown");         }         private void MyClickEvent(object sender, RoutedEventArgs e)         {             Debug.WriteLine("MyClickEvent");         }         private void MouseLeftButtonDown(object sender, RoutedEventArgs e)         {             Debug.WriteLine("MouseLeftButtonDown");         }         private void MouseDownButton(object sender, RoutedEventArgs e)         {             Debug.WriteLine("MouseDownButton");         }         private void MouseDownGrid(object sender, RoutedEventArgs e)         {             Debug.WriteLine("MouseDownGrid");         }     } }