RoutedEvents: Tunneled Key Press

   
  
<Window x:Class="RoutedEvents.TunneledKeyPress"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="TunneledKeyPress" Height="400" Width="400" PreviewKeyDown="SomeKeyPressed" >
  <StackPanel>
    <Label Margin="5" BorderBrush="Black" BorderThickness="1" HorizontalContentAlignment="Stretch"
           PreviewKeyDown="SomeKeyPressed">
      <StackPanel PreviewKeyDown="SomeKeyPressed">
        <TextBlock Margin="3" HorizontalAlignment="Center" PreviewKeyDown="SomeKeyPressed">
          Image and text label
        </TextBlock>
        <Image Source="c:image.jpg" Stretch="None" PreviewKeyDown="SomeKeyPressed"/>
        <DockPanel Margin="10" PreviewKeyDown="SomeKeyPressed"> 
          <TextBlock Margin="3" PreviewKeyDown="SomeKeyPressed">Type here:</TextBlock>
          <TextBox PreviewKeyDown="SomeKeyPressed" KeyDown="SomeKeyPressed"></TextBox>
        </DockPanel>
      </StackPanel>
    </Label>
    <ListBox Margin="5" Name="lstMessages"></ListBox>
    <CheckBox Margin="5" Name="chkHandle">Handle first event</CheckBox>
    <Button Click="cmdClear_Click" HorizontalAlignment="Right" Margin="5" Padding="3">Clear List</Button>
  </StackPanel>
</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;

namespace RoutedEvents
{
    public partial class TunneledKeyPress : System.Windows.Window
    {
        public TunneledKeyPress()
        {
            InitializeComponent();
        }

        protected int eventCounter = 0;

        private void SomeKeyPressed(object sender, RoutedEventArgs e)
        {
            eventCounter++;
            string message = "#" + eventCounter.ToString() + ":
" +
                " Sender: " + sender.ToString() + "
" +
                " Source: " + e.Source + "
" +
                " Original Source: " + e.OriginalSource + "
" +
                " Event: " + e.RoutedEvent;
            lstMessages.Items.Add(message);
            e.Handled = (bool)chkHandle.IsChecked;
        }

        private void cmdClear_Click(object sender, RoutedEventArgs e)
        {
            eventCounter = 0;
            lstMessages.Items.Clear();
        }
    }
}