public function validateRequired($value)
    {
        // Check for file!
        if (true === is_array($value) && true === array_key_exists('tmp_name', $value)) {
            // At least it was uploaded its valid in meaning of "required" <= NOT EMPTY
            $valid = ($value['error'] < UPLOAD_ERR_PARTIAL);
        } else {
            // Plain value ...
            $valid = (!is_null($value) && (is_array($value) || is_object($value) || (strlen($value) > 0)));
        }

        return $valid;
    }