if (current_mixer_strip->get_parent() == 0) {
global_hpacker.pack_start (*current_mixer_strip, Gtk::PACK_SHRINK );
global_hpacker.reorder_child (*current_mixer_strip, 0);
if (current_mixer_strip->get_parent() == 0) {
global_hpacker.pack_start (*current_mixer_strip, Gtk::PACK_SHRINK );
global_hpacker.reorder_child (*current_mixer_strip, 0);