gtk/widget.go
func (v *Widget) SetParentWindow(parentWindow *gdk.Window) {
	C.gtk_widget_set_parent_window(v.native(),
		(*C.GdkWindow)(unsafe.Pointer(parentWindow.Native())))
}
func (v *Widget) SetParentWindow(parentWindow *gdk.Window) {
	C.gtk_widget_set_parent_window(v.native(),
		(*C.GdkWindow)(unsafe.Pointer(parentWindow.Native())))
}
// SetParentWindow is a wrapper around gtk_widget_set_parent_window().