code: func ButtonNewFromStock(stock Stock) (*Button, error) {
  	cstr := C.CString(string(stock))
  	defer C.free(unsafe.Pointer(cstr))
  	c := C.gtk_button_new_from_stock((*C.gchar)(cstr))
  	if c == nil {
  		return nil, nilPtrErr
  	}
  	return wrapButton(glib.Take(unsafe.Pointer(c))), nil
  }
docs: // ButtonNewFromStock is a wrapper around gtk_button_new_from_stock().