title: WPF touchscreen events not working properly
body: <p>I've created a WPF touchscreen application at work. </p>
  
  <p>When I use a mouse, it behaves as you would expect. However, when using the touchscreen it doesn't behave as it should. It will regularly lag on a PreviewMouseDown touch event, and sometimes won't actually respond at all. Other times it works fine.</p>
  
  <p>Does anybody know what could cause this behaviour, and what can I do to resolve it?</p>
  
  <p>Many thanks</p>