读取xml节点下的内容，并添加到NavBarControl中

            string tulipath = Application.StartupPath + "//tuli.xml";   //xml路径       
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load(tulipath);//加载xml
            XmlNode root = xmlDoc.SelectSingleNode("//root");//寻找root节点
            string groups = "";
            if (root != null)
            {
                groups = (root.SelectSingleNode("Groups")).InnerText;//读取节点root的子节点Groups中的内容
            }
            string[] group = groups.Split('\n');
            NavBarItem item = new NavBarItem();//申明NavBarItem
            foreach (string groupItem in group)
            {
                item = navBarControl.Items.Add();//navBarControl是NavBarControl
                item.Caption = groupItem;
                navBarGroup.ItemLinks.Add(item); //navBarGroup是NavBarControl中的NavBarGroup
            }