BCGControlBar Pro for MFC
void CBCGPChartSeries::SetSeriesLineColor ( const CBCGPBrush br,
int  nDataPointIndex = -1 

Sets color either for all series lines, or for specified data point.

Use this method to set color for series lines. If nDataPointIndex is -1, the specified color will be used for all data points that have not been formatted individually.

brA reference to a brush used to draw series lines.
nDataPointIndexSpecifies a data point index. Use -1 to set the option for a series.