public function getNewEmptyItem()
    {
        $model = Mage::getModel($this->model);

        if (!$model instanceof Aoe_Scheduler_Model_Job) {
            Mage::throwException(
                sprintf(
                    'Invalid model class. Expected "%s" and received "%s".',
                    'Aoe_Scheduler_Model_Job',
                    (is_object($model) ? get_class($model) : 'UNKNOWN')
                )
            );
        }

        return $model;
    }