private void RaiseCircleGestureEvent(CircleGestureEventArgs e)
 {
     if (CircleGestureDetected != null)
     {
         CircleGestureDetected(this, e);
         Angle = e.Angle;
     }
 }
 private void OnCircleGestureDetected(object sender, CircleGestureEventArgs e)
 {
     RaiseCircleGestureEvent(e);
 }