func ButtonNewFromIconName(iconName string, size IconSize) (*Button, error) {
	cstr := C.CString(iconName)
	defer C.free(unsafe.Pointer(cstr))
	c := C.gtk_button_new_from_icon_name((*C.gchar)(cstr),
		C.GtkIconSize(size))
	if c == nil {
		return nil, nilPtrErr
	}
	return wrapButton(glib.Take(unsafe.Pointer(c))), nil
}
func ButtonNewFromIconName(iconName string, size IconSize) (*Button, error) {
	cstr := C.CString(iconName)
	defer C.free(unsafe.Pointer(cstr))
	c := C.gtk_button_new_from_icon_name((*C.gchar)(cstr),
		C.GtkIconSize(size))
	if c == nil {
		return nil, nilPtrErr
	}
	return wrapButton(glib.Take(unsafe.Pointer(c))), nil
}
/*
 * GtkButton
 */
// ButtonNewFromIconName is a wrapper around gtk_button_new_from_icon_name().