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Gets the ISparkColor object that represents the color and visibility of the marker for the first point of data on a sparkline.
ISparkColor Firstpoint { get; }
ReadOnly Property Firstpoint As ISparkColor
worksheet.Range["A1:A4"].Value = new object[,] {{5}, {2}, {7}, {3}};
ISparklineGroup group = worksheet.Range["B1"].SparklineGroups.Add(SparkType.Line, "A1:A4");
ISparkColor firstpoint = group.Points.Firstpoint;
firstpoint.Visible = true;
firstpoint.Color.Color = Color.Red;