auto toolbar = ui::Toolbar::from( gtk_toolbar_new() );
gtk_orientable_set_orientation( GTK_ORIENTABLE(toolbar), GTK_ORIENTATION_HORIZONTAL );
gtk_toolbar_set_style( toolbar, GTK_TOOLBAR_ICONS );
auto toolbar = ui::Toolbar::from( gtk_toolbar_new() );
gtk_orientable_set_orientation( GTK_ORIENTABLE(toolbar), GTK_ORIENTATION_HORIZONTAL );
gtk_toolbar_set_style( toolbar, GTK_TOOLBAR_ICONS );