code: func (v *MessageDialog) GetImage() (*Widget, error) {
  	c := C.gtk_message_dialog_get_image(v.native())
  	if c == nil {
  		return nil, nilPtrErr
  	}
  	return wrapWidget(glib.Take(unsafe.Pointer(c))), nil
  }
docs: /*
   * GtkMessageDialog
   */
  // GetImage is a wrapper around gtk_message_dialog_get_image().