gtk/gtk.go
func (v *Notebook) GetMenuLabelText(child IWidget) (string, error) {
	c := C.gtk_notebook_get_menu_label_text(v.native(), child.toWidget())
	if c == nil {
		return "", errors.New("No menu label for widget")
	}
	return goString(c), nil
}
func (v *Notebook) GetMenuLabelText(child IWidget) (string, error) {
	c := C.gtk_notebook_get_menu_label_text(v.native(), child.toWidget())
	if c == nil {
		return "", errors.New("No menu label for widget")
	}
	return goString(c), nil
}
// GetMenuLabelText() is a wrapper around gtk_notebook_get_menu_label_text().