protected function addEntityFields($form, $options)
    {
        $form
        ->add('fields', WidgetFieldsFormType::class, [
            'label'     => 'widget.form.entity.fields.label',
            'namespace' => $options['namespace'],
            'widget'    => $options['widget'],
        ])
        ->add('entity_proxy', EntityProxyFormType::class, [
            'business_entity_id' => $options['businessEntityId'],
            'namespace'          => $options['namespace'],
            'widget'             => $options['widget'],
        ]);
    }