void ProgressSliderChanged(object sender, ScrubberValueChangedEventArgs e)
 {
     if (!_ignoreScrubberValueChanges)
     {
         UncheckPlayStopButton();
         _stage.Player.SetProgress(e.NewValue);
     }
 }
 void ProgressSliderChanged(object sender, ScrubberValueChangedEventArgs e)
 {
     if (!_ignoreScrubberValueChanges)
     {
         _playStopButton.IsChecked = false;
         _stage.Player.SetProgress(e.NewValue);
     }
 }