gtk/gtk.go
func (v *Expander) SetLabelWidget(widget IWidget) {
	C.gtk_expander_set_label_widget(v.native(), widget.toWidget())
}
func (v *Expander) SetLabelWidget(widget IWidget) {
	C.gtk_expander_set_label_widget(v.native(), widget.toWidget())
}
// SetLabelWidget is a wrapper around gtk_expander_set_label_widget().