protected function scaffoldForm($formName, array $context = [], array $extra = [])
    {
        /** @var FormFactory $scaffolder */
        $scaffolder = Injector::inst()->get(DataObjectVersionFormFactory::class);
        $form = $scaffolder->getForm($this, $formName, $context);

        // Set form handler with class name, ID and VersionID
        return $form->setRequestHandler(
            LeftAndMainFormRequestHandler::create($form, $extra)
        );
    }