public function getAjaxList($inputControlId, $limit = 20, $page = 1, $search = null)
    {
        if (array_key_exists($inputControlId, $this->ajaxFunctionMap)) {
            return call_user_func(array($this, $this->ajaxFunctionMap[$inputControlId]), $limit, $page, $search);
        } else {
            return null;
        }
    }