public override void OnClick()
        {
            ILayer pLayer = (ILayer)_mapControl.CustomProperty;

            LayerMoveClass.MoveLayer(_mapControl.Map, pLayer, enumMoveTo.enumMoveDown);
            //_tocControl.SelectItem(pLayer, null);
            //_tocControl.Update();
        }
        public override void OnClick()
        {
            ILayer pLayer = (ILayer)_mapControl.CustomProperty;

            LayerMoveClass.MoveLayer(_mapControl.Map, pLayer, enumMoveTo.enumMoveTop);
        }