private void _fields_DictionaryOperation(object sender, DictionaryOperationEventArgs <string, string> e)
 {
     IsModified = true;
 }
 private void OnEnginePlayingEventsDictionaryOperation(object o, DictionaryOperationEventArgs<VideoLayer, Event> e)
 {
     Application.Current.Dispatcher.BeginInvoke((Action)delegate()
     {
         if (e.Operation == TDictionaryOperation.Add)
             _visibleEvents.Add(e.Value);
         else
             _visibleEvents.Remove(e.Value);
     });
 }