fixes #6585

fixes #6585
That's overriding method from fieldset. So either we need to figure out a new name for this or keep it public :(
We could take that method away from the form all together but that would change the existing behavior a little (Namely that the form would populate every field instead of just the base during bind and validation without data).. All the tests seem to pass then also, but I'd be surprised if there wouldn't be any side effects in some app.