private function createDeleteRoleScopeForm(PermissionsGroup $permissionsGroup,
            RoleScope $roleScope)
    {
        return $this->createFormBuilder()
            ->setAction($this->generateUrl('admin_permissionsgroup_delete_role_scope', 
                    array('pgid' => $permissionsGroup->getId(), 'rsid' => $roleScope->getId())))
            ->setMethod('DELETE')
            ->add('submit', 'submit', array('label' => 'Delete'))
            ->getForm()
        ;
    }