private void CreateColours(string colourName, byte red, byte green, byte blue)
        {
            var palette = XlsWorkbook.GetCustomPalette();
            var colour  = palette.FindSimilarColor(red, green, blue) ?? palette.AddColor(red, green, blue);

            _colours.Add(colourName, colour);
        }
        private void CreateColours(string colourName, byte red, byte green, byte blue)
        {
            HSSFPalette palette = XlsWorkbook.GetCustomPalette();
            HSSFColor   colour  = palette.FindSimilarColor(red, green, blue);

            if (colour == null)
            {
                // First 64 are system colours
                //srl this code does not work with the latest version of NPOI
                //if  (NPOI.HSSF.Record.PaletteRecord.STANDARD_PALETTE_SIZE  < 64 )
                //{
                //     NPOI.HSSF.Record.PaletteRecord.STANDARD_PALETTE_SIZE = 64;
                //}
                //NPOI.HSSF.Record.PaletteRecord.STANDARD_PALETTE_SIZE++;
                colour = palette.AddColor(red, green, blue);
            }
            _colours.Add(colourName, colour);
        }