public function getStatusClass($status)
    {
        switch ($status) {
            case static::Status_Success:
                $result = 'success';
                break;
            case static::Status_Info:
                $result = 'info';
                break;
            case static::Status_Warning:
                $result = 'warning';
                break;
            case static::Status_Error:
            default:
                $result = 'error';
                break;
        }
        return $result;
    }