添加图层组

        /// 

        /// 添加图层组
        /// 
        /// 
        /// 
        public static void addLayerGroup(IMapControl3 pMapControl, String pGroupName)
        {
            IGroupLayer groupLayer = new GroupLayerClass();
            groupLayer.Name = pGroupName;
            pMapControl.Map.AddLayer(groupLayer);
        }