public function hasHelper($helperType)
    {
        if ($this->isValidKey($helperType)) {
            if (!is_null($formHelperMap = $this->getHelperMap()->get($helperType))
                && count($formHelperMap) > 0
            ) {
                return true;
            }
        } else {
            throw new InvalidArgumentException('Invalid form helper type given');
        }
        return false;
    }