code: func AboutDialogNew() (*AboutDialog, error) {
  	c := C.gtk_about_dialog_new()
  	if c == nil {
  		return nil, nilPtrErr
  	}
  	obj := glib.Take(unsafe.Pointer(c))
  	return wrapAboutDialog(obj), nil
  }
docs: // AboutDialogNew is a wrapper around gtk_about_dialog_new().