func (a *Box) SetCenterWidget(child IWidget) {
	if child == nil {
		C.gtk_box_set_center_widget(a.native(), nil)
	} else {
		C.gtk_box_set_center_widget(a.native(), child.toWidget())
	}
}
func (a *Box) SetCenterWidget(child IWidget) {
	if child == nil {
		C.gtk_box_set_center_widget(a.native(), nil)
	} else {
		C.gtk_box_set_center_widget(a.native(), child.toWidget())
	}
}
func ( a * Box ) SetCenterWidget ( child IWidget ) { if child == nil { C . gtk_box_set_center_widget ( a . native ( ) , nil ) } else { C . gtk_box_set_center_widget ( a . native ( ) , child . toWidget ( ) ) } }
//gtk_box_bar_set_center_widget(GtkBox *box,GtkWidget *center_widget)
gtk_box_bar_set_center_widget ( GtkBox * box GtkWidget * center_widget )