private function createAddLinkGroupCenterForm(User $user)
    {
        return $this->createFormBuilder()
                ->setAction($this->generateUrl('admin_user_add_group_center', 
                        array('uid' => $user->getId())))
                ->setMethod('POST')
                ->add(self::FORM_GROUP_CENTER_COMPOSED, new ComposedGroupCenterType())
                ->add('submit', 'submit', array('label' => 'Add a new groupCenter'))
                ->getForm()
                ;
    }