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Event firing sequence

<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.vb Imports System Imports System.Collections.Generic Imports System.Text Imports System.Windows Imports System.Windows.Controls Imports System.Windows.Data Imports System.Windows.Documents Imports System.Windows.Input Imports System.Windows.Media Imports System.Windows.Media.Imaging Imports System.Windows.Shapes Imports System.Diagnostics Namespace TunnelingBubbling   Public Partial Class Window1     Inherits System.Windows.Window     Public Sub New()       InitializeComponent()     End Sub     Private Sub PreviewMouseDownGrid(sender As Object, e As RoutedEventArgs)       Debug.WriteLine("PreviewMouseDownGrid")     End Sub     Private Sub PreviewMouseDownButton(sender As Object, e As RoutedEventArgs)       Debug.WriteLine("PreviewMouseDownButton")     End Sub     Private Sub PreviewMouseLeftButtonDown(sender As Object, e As RoutedEventArgs)       Debug.WriteLine("PreviewMouseLeftButtonDown")     End Sub     Private Sub MyClickEvent(sender As Object, e As RoutedEventArgs)       Debug.WriteLine("MyClickEvent")     End Sub     Private Sub MouseLeftButtonDown(sender As Object, e As RoutedEventArgs)       Debug.WriteLine("MouseLeftButtonDown")     End Sub     Private Sub MouseDownButton(sender As Object, e As RoutedEventArgs)       Debug.WriteLine("MouseDownButton")     End Sub     Private Sub MouseDownGrid(sender As Object, e As RoutedEventArgs)       Debug.WriteLine("MouseDownGrid")     End Sub   End Class End Namespace