title: MouseLeftButtonDown event not fire while Touching the WPF window
body: <p>I have a custom control which inherits from Control and I'm trying to trigger MouseLeftButtonDown using Touch on WPF platform.The event MouseLeftButtonDown does not fire while touch the window but its works fine when use mouse device. I have tried the related PreviewMouseLeftButtonDown event also nothing happens while touch the window. 
  Please suggest me the solution.
  Regards,
  Jeyasri M</p>