gtk/gtk.go
func (v *Expander) SetLabel(label string) {
	var cstr *C.char
	if label != "" {
		cstr = C.CString(label)
		defer C.free(unsafe.Pointer(cstr))
	}
	C.gtk_expander_set_label(v.native(), (*C.gchar)(cstr))
}
func (v *Expander) SetLabel(label string) {
	var cstr *C.char
	if label != "" {
		cstr = C.CString(label)
		defer C.free(unsafe.Pointer(cstr))
	}
	C.gtk_expander_set_label(v.native(), (*C.gchar)(cstr))
}
// SetLabel is a wrapper around gtk_expander_set_label().