smaller_hbox->pack_start (preset_label, false, false, 4);
smaller_hbox->pack_start (_preset_modified, false, false);
smaller_hbox->pack_start (_preset_combo, false, false);
smaller_hbox->pack_start (preset_label, false, false, 4);
smaller_hbox->pack_start (_preset_modified, false, false);
smaller_hbox->pack_start (_preset_combo, false, false);