TouchDown Events Continue Rising to MouseLeftButton Events

Question

In a WPF application running on Windows 8, TouchDown events always propagate to MouseLeftButton events. I don’t know why and want to avoid it.

Here is a complete code example:

Xaml

<Window x:Class="TestTouchAndMouse.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525"
        Stylus.IsPressAndHoldEnabled="False">
    <Canvas x:Name="MyCanvas" Background="White" IsManipulationEnabled="False">
        <TextBox x:Name="TB" InkCanvas.Top="50" InkCanvas.Left="10" FontSize="20" />
    </Canvas>
</Window>

WITH#

namespace TestTouchAndMouse
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            MyCanvas.MouseLeftButtonDown += MyCanvas_MouseLeftButtonDown;
            MyCanvas.MouseRightButtonDown += MyCanvas_MouseRightButtonDown;
            MyCanvas.TouchDown += MyCanvas_TouchDown;
        }

         void MyCanvas_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
         {
             e.Handled = true;
             TB.Text = "MOUSE RIGHT !";
         }
         void MyCanvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
         {
             e.Handled = true;
             TB.Text = "MOUSE LEFT !";
         }
         void MyCanvas_TouchDown(object sender, TouchEventArgs e)
         {
             e.Handled = true;
             TB.Text = "TOUCH !";
         }
     }
}

On windows 7

• everything is working fine.

On windows 8

• MouseLeftButton or MouseRightButton events show "Left mouse!" or "Mouse is right!" as was expected.
• TouchDown events will be displayed very quickly "Touch!" and then the text will change to "Left mouse!".