GridControl 分组排序

this.list.gridControl.ItemsSource = lsItem;

                this.list.gridControl.GroupBy("GroupTitle");
                this.list.gridControl.Columns["GroupTitle"].SortOrder = ColumnSortOrder.Descending;
                //this.list.gridControl.SortBy(this.list.gridControl.Columns["GroupTitle"], ColumnSortOrder.Descending);

                this.list.gridControl.ExpandAllGroups();