void _export(object o)
 {
     _checking = true;
     InvalidateRequerySuggested();
     try
     {
         //TODO: check if exporting files fit in device free space
     }
     finally
     {
         _checking = false;
         InvalidateRequerySuggested();
     }
     _mediaManager.Export(Items.Select(mevm => mevm.MediaExport).ToArray(), _concatMedia, _concatMediaName, (IIngestDirectory)SelectedDirectory.Directory, _mXFAudioExportFormat, _mXFVideoExportFormat);
     _view.Close();
 }