public function onRegister(Event\Register $event)
    {
        $userModel = $this->getServiceLocator()
                          ->get('Grid\User\Model\User\Model');
        $user      = $userModel->register( $event->getData() );
        $event->setUser($user);
        if( is_null($event->getUser()) )
        {
            $event->stopPropagation(true);
        }
        return $event;
    }