void horizontal_size_request (GtkRequisition*);
void horizontal_size_allocate (Gtk::Allocation&);
void queue_horizontal_redraw (const Glib::RefPtr<Gdk::Window>&, float);
void horizontal_size_request (GtkRequisition*);
void horizontal_size_allocate (Gtk::Allocation&);
void queue_horizontal_redraw (const Glib::RefPtr<Gdk::Window>&, float);