public function delete($sOxId = null)
    {
        $sOxId = $sOxId ? $sOxId : $this->getId();

        $this->load($sOxId);
        // if record cannot be delete, abort deletion
        if ($blDeleted = parent::delete($sOxId)) {
            $this->_deleteFile();
        }

        return $blDeleted;
    }