怎样撤销删除

private void Form1_Load(object sender, EventArgs e)

    {

        FarPoint.Win.Spread.InputMap im = new FarPoint.Win.Spread.InputMap();



        im = fpSpread1.GetInputMap(FarPoint.Win.Spread.InputMapMode.WhenFocused);

        im.Put(new FarPoint.Win.Spread.Keystroke(Keys.Delete, Keys.None), FarPoint.Win.Spread.SpreadActions.ClearSelectedCells);



        im = fpSpread1.GetInputMap(FarPoint.Win.Spread.InputMapMode.WhenAncestorOfFocused);

        im.Put(new FarPoint.Win.Spread.Keystroke(Keys.Delete, Keys.None), FarPoint.Win.Spread.SpreadActions.ClearSelectedCells);

    }

上述代码是按del可以删除选中单元格内容，怎样撤销删除呢？

你好，

你可以参考这个帖子中的列子http://gcdn.grapecity.com/showto ... ;postid=27711#27711