private void gridView1_PopupMenuShowing(object sender, DevExpress.XtraGrid.Views.Grid.PopupMenuShowingEventArgs e)        {            if (e.MenuType == DevExpress.XtraGrid.Views.Grid.GridMenuType.Column)//判断是否是列标题的右键菜单            {                GridViewColumnMenu menu = e.Menu as GridViewColumnMenu;                menu.Items.RemoveAt(6);//移除右键菜单中的第7个功能，从0开始                //menu.Items.Clear()清除所有功能                //Items.Add(参数，参数，参数)添加功能            }        }