vbox.pack_start (display_model_composite_separate_rb, false, false);
vbox.pack_start (display_model_composite_all_tracks_rb, false, false);
// "Composite graphs for all tracks"
display_model_composite_separate_rb.signal_toggled().connect (
vbox.pack_start (display_model_composite_separate_rb, false, false);
vbox.pack_start (display_model_composite_all_tracks_rb, false, false);
// "Composite graphs for all tracks"
display_model_composite_separate_rb.signal_toggled().connect (