buttons.attach (sound_notes_button, 0, 1, 0, 1);
Glib::RefPtr<Gtk::Action> act = ActionManager::get_action ("Editor", "sound-midi-notes");
if (act) {
buttons.attach (sound_notes_button, 0, 1, 0, 1);
Glib::RefPtr<Gtk::Action> act = ActionManager::get_action ("Editor", "sound-midi-notes");
if (act) {