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Gets or sets the tint and shade adjustment of this gradient stop.
Use a value from -1.0 to 1.0, where 0 means no adjustment, negative values make the color darker, and positive values make the color lighter.
double TintAndShade { get; set; }
Property TintAndShade As Double
IRange range = worksheet.Range["A1"];
range.Interior.Pattern = Pattern.LinearGradient;
IColorStop colorStop = ((ILinearGradient) range.Interior.Gradient).ColorStops[0];
colorStop.ThemeColor = ThemeColor.Accent1;
colorStop.TintAndShade = 0.25;
double tintAndShade = colorStop.TintAndShade;