public function renderHelper($identifier, $config = array())
    {
        $args = func_get_args();
        $identifier = array_shift($args);

        //Get the function to call based on the $identifier
        $parts = explode('.', $identifier);
        $function = array_pop($parts);

        $helper = implode('.', $parts);

        $helper = $this->getHelper($helper);

        //Call the helper function
        if (!is_callable(array($helper, $function))) {
            throw new LibBaseTemplateHelperException(get_class($helper).'::'.$function.' not supported.');
        }

        return call_object_method($helper, $function, $args);
    }