private void MousePositionChanged(object sender, MousePositionChangedEventArgs eventargs)
 {
     Dispatcher.BeginInvoke(new Action<Point>(UpdateLocation), eventargs.Position);
 }
 private void MousePositionChanged(object sender, MousePositionChangedEventArgs eventargs)
 {
     Dispatcher.BeginInvoke(new Action <Point>(UpdateLocation), eventargs.Position);
 }