// videoView
 private void VideoView_PositionChanged(VideoView view, double length, double position)
 {
     // video track 위치가 변경되면 해당하는 track point를 찾아 전역 이벤트를 발생시킨다.
     Track track = view.Track;
     if (track != null) {
         TrackPoint point = track.FindPoint(position);
         if (point != null) {
             PersonalDomain.Domain.EventAggregator.GetEvent<TrackPointChangedEvent>().Publish(point);
         }
     }
 }
 private void VideoView_PlayEnded(VideoView view)
 {
     Events.GetEvent<TrackDeactivatedEvent>().Publish(view.Track);
 }