在setting 里 imputmap
也可以通过代码设置
InputMap im = fpSpread1.GetInputMap(InputMapMode.WhenFocused);
im.Put(new FarPoint.Win.Spread.Keystroke(System.Windows.Forms.Keys.Delete, System.Windows.Forms.Keys.None), FarPoint.Win.Spread.SpreadActions.ClearSelectedCells);
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