spread的线的颜色的设置

spread6中的gridcolor，帮助文档说对应到spread7是HorizontalGridLine和VerticalGridLine

比如spread6：FpSpread1.GridColor=vbRed
对应到spread7：
      Dim gl As New FarPoint.Win.Spread.GridLine(FarPoint.Win.Spread.GridLineType.Raised, Color.Red)      FpSpread1.ActiveSheet.HorizontalGridLine = gl      FpSpread1.ActiveSheet.VerticalGridLine = gl
为什么我这样做了，线的颜色没有变成红色呢

line type 用Flat

            FarPoint.Win.Spread.GridLine gl = new FarPoint.Win.Spread.GridLine(GridLineType.Flat, Color.Blue);
            fpSpread1.ActiveSheet.HorizontalGridLine = gl;

如果用Raised 还需要设置两个颜色
            FarPoint.Win.Spread.GridLine gl = new FarPoint.Win.Spread.GridLine(FarPoint.Win.Spread.GridLineType.Raised, Color.Blue, Color.Red, Color.Yellow, 3);
            fpSpread1.ActiveSheet.HorizontalGridLine = gl;
            fpSpread1.ActiveSheet.VerticalGridLine = gl;