private void SliderTimeOnDragCompleted(object sender, System.Windows.Controls.Primitives.DragCompletedEventArgs e)
 {
     MediaElementLeft.Play();
     MediaElementRight.Play();
     MediaElementFront.Play();
     MediaElementBack.Play();
 }
 private void ButtonPlayPauseOnClick(object sender, RoutedEventArgs e)
 {
     if (_isPaused)
     {
         MediaElementLeft.Play();
         MediaElementRight.Play();
         MediaElementFront.Play();
         MediaElementBack.Play();
     }
     else
     {
         MediaElementLeft.Pause();
         MediaElementRight.Pause();
         MediaElementFront.Pause();
         MediaElementBack.Pause();
     }
     _isPaused = !_isPaused;
 }