protected function getTareaOr404($idtarea = 'id_tarea')
 {
     if (!$this->getRequestParameter($idtarea)) {
         $this->forward404();
     } else {
         $c = $this->getCriterio();
         $c->addAnd(TareaPeer::ID_TAREA, $this->getRequestParameter($idtarea));
         $tarea = TareaPeer::doSelectOne($c);
         $this->forward404Unless($tarea);
     }
     return $tarea;
 }