public JsonResult GetTopGroups()
        {
            invMarketGroupDAC dac = new invMarketGroupDAC();
            List<MarketGroupMenuModel> marketGroups = dac.GetTopLevelMenuGroups();

            return Json(marketGroups, JsonRequestBehavior.AllowGet);
        }
        public JsonResult GetChildGroups(int id)
        {
            invMarketGroupDAC dac = new invMarketGroupDAC();
            List<MarketGroupMenuModel> marketGroups = dac.GetChildMenuGroups(id);

            return Json(marketGroups, JsonRequestBehavior.AllowGet);
        }