public function loadModel($id, $model = false)
    {
        if (!$model)
            $model = str_replace('Controller', '', get_class($this));
        if ($this->_loadModel === null) {
            $this->_loadModel = CActiveRecord::model($model)->findbyPk($id);
            if ($this->_loadModel === null)
                throw new CHttpException(404, Yii::t('email', 'The requested page does not exist.'));
        }
        return $this->_loadModel;
    }