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))
                    {
                        //選中行是否展開
                        bool expanded = winGridView1.gridView1.GetRowExpanded(info.RowHandle);
                        //設定選中行是否展開或者收起來
                        winGridView1.gridView1.SetRowExpanded(info.RowHandle, !expanded);
                    }
                }
            }            

        }