gtk/widget.go
func (v *Widget) SetParent(parent IWidget) {
	C.gtk_widget_set_parent(v.native(), parent.toWidget())
}
func (v *Widget) SetParent(parent IWidget) {
	C.gtk_widget_set_parent(v.native(), parent.toWidget())
}
// SetParent is a wrapper around gtk_widget_set_parent().