private void _export(object obj)
 {
     var selections = _getSelections().Select( m => new MediaExport(m, m.TCPlay, m.DurationPlay, m.AudioVolume));
     using (ExportViewmodel evm = new ExportViewmodel(this._mediaManager, selections)) { }
 }
 private void _export(object obj)
 {
     var selections = _selectedEvents.Where(e => e.Media != null && e.Media.MediaType == TMediaType.Movie).Select(e => new MediaExport(e.Media, e.ScheduledTC, e.Duration, e.AudioVolume));
     using (ExportViewmodel evm = new ExportViewmodel(_engine.MediaManager, selections)) { }
 }