Inheritance: System.Windows.Input.TouchDevice
 private void PromoteToTouchUp()
 {
     if (promotionTouchDevice == null)
     {
         PromoteToTouchDown();
     }
     promotionTouchDevice.TouchUp(lastHandPointEventArgs);
     promotionTouchDevice = null;
 }
 private void PromoteToTouchDown()
 {
     if (promotionTouchDevice == null)
     {
         promotionTouchDevice = new MotionTrackingTouchDevice(lastHandPointEventArgs, rootWindow, screen);
     }
     promotionTouchDevice.TouchDown(lastHandPointEventArgs);
 }