//Gtk::HPaned* hpaned(manage(new Gtk::HPaned()));
//hpaned->show();
//attach(*hpaned, 0, 3, 0, 1, Gtk::EXPAND|Gtk::FILL,Gtk::EXPAND|Gtk::FILL, 0, 0);
//attach(*create_layer_tree(), 0, 3, 0, 1, Gtk::EXPAND|Gtk::FILL,Gtk::EXPAND|Gtk::FILL, 0, 0);
//Gtk::HPaned* hpaned(manage(new Gtk::HPaned()));
//hpaned->show();
//attach(*hpaned, 0, 3, 0, 1, Gtk::EXPAND|Gtk::FILL,Gtk::EXPAND|Gtk::FILL, 0, 0);
//attach(*create_layer_tree(), 0, 3, 0, 1, Gtk::EXPAND|Gtk::FILL,Gtk::EXPAND|Gtk::FILL, 0, 0);