private function getFileValidatorProperty($model = null, $attribute = null, $property = null)
	{
		if (!isset($model, $attribute, $property)) {
			return null;
		}

		foreach ($model->getValidators($attribute) as $validator) {
			if ($validator instanceof CFileValidator) {
				$ret = $validator->$property;
			}
		}
		return isset($ret) ? $ret : null;
	}