gtk/gtk.go
func ButtonNewWithLabel(label string) (*Button, error) {
	cstr := C.CString(label)
	defer C.free(unsafe.Pointer(cstr))
	c := C.gtk_button_new_with_label((*C.gchar)(cstr))
	if c == nil {
		return nil, nilPtrErr
	}
	obj := glib.Take(unsafe.Pointer(c))
	return wrapButton(obj), nil
}
func ButtonNewWithLabel(label string) (*Button, error) {
	cstr := C.CString(label)
	defer C.free(unsafe.Pointer(cstr))
	c := C.gtk_button_new_with_label((*C.gchar)(cstr))
	if c == nil {
		return nil, nilPtrErr
	}
	obj := glib.Take(unsafe.Pointer(c))
	return wrapButton(obj), nil
}
// ButtonNewWithLabel() is a wrapper around gtk_button_new_with_label().