code: public function configureOptions(OptionsResolver $resolver)
      {
          $resolver->setDefaults(
              array(
                  'inherit_data' => true,
                  'data_class' => $this->contentItemClassName,
                  'container' => '',
                  'default_regions' => $this->defaultRegions,
                  'translation_domain' => 'admin',
              )
          );
      }
docs: {@inheritDoc}