class FormConfigBuilder implements FormConfigBuilderInterface 
 A basic form configuration. 
Methods
   __construct(string|int $name, string $dataClass, EventDispatcherInterface $dispatcher, array $options = array()) Creates an empty form configuration.  
 FormConfigBuilderInterface   addEventListener(string $eventName, callable $listener, int $priority) Adds an event listener to an event on this form.  
 FormConfigBuilderInterface   addEventSubscriber(EventSubscriberInterface $subscriber) Add