function edit($id = null){
            if(!$id){
                $this->Session->setFlash('Tarea invalida');
                $this->redirect(array('action'=>'index'),null,true);
            }
            if(empty($this->data)){
                $this->data = $this->Tarea->find(array('id'=>$id));
            }else{
                if($this->Tarea->save($this->data)){
                    $this->Session->setFlash('La tarea ha sido salvada');
                    $this->redirect(array('action'=>'index'),null,true);
                }else{
                    $this->Session->setFlash('La tarea no ha podido ser salvada. Intentelo de nuevo');
                }
            }
        }