trackmenu->add_item(new DeleteTracks(mwindow));
trackmenu->add_item(new DeleteTrack(mwindow));
trackmenu->add_item(new ConcatenateTracks(mwindow));
trackmenu->add_item(new DeleteTracks(mwindow));
trackmenu->add_item(new DeleteTrack(mwindow));
trackmenu->add_item(new ConcatenateTracks(mwindow));