private function createDeleteLinkGroupCenterForm(User $user, GroupCenter $groupCenter)
    {
        return $this->createFormBuilder()
            ->setAction($this->generateUrl('admin_user_delete_group_center', 
                    array('uid' => $user->getId(), 'gcid' => $groupCenter->getId())))
            ->setMethod('DELETE')
            ->add('submit', 'submit', array('label' => 'Delete'))
            ->getForm()
        ;
    }