dev GridView 分组，单击展开隐藏

        void gridView1_MouseDown(object sender, MouseEventArgs e)
        {

            GridHitInfo info;
            Point pt = winGridView1.gridView1.GridControl.PointToClient(Control.MousePosition);
            info = winGridView1.gridView1.CalcHitInfo(pt);

            if (info.InRow && winGridView1.gridView1.IsGroupRow(info.RowHandle) && info.HitTest != GridHitTest.RowGroupButton)
            {
                if (e.Clicks == 1 && e.Button == MouseButtons.Left)
                {
                    if (winGridView1.gridView1.IsGroupRow(info.RowHandle))
                    {
                        //选中行是否展开
                        bool expanded = winGridView1.gridView1.GetRowExpanded(info.RowHandle);
                        //设置选中行是否展开或者收起来
                        winGridView1.gridView1.SetRowExpanded(info.RowHandle, !expanded);
                    }
                }
            }            

        }