BCGControlBar Pro for MFC
void CBCGPChartLineSeries::EnableColorEachLine ( BOOL  bEnable,
BOOL  bRedraw = FALSE 

Allows to draw each series line with a distinct color.

If you enable this option, each line will be drawn with distinct color, which is generated automatically if you don't format individual data points.

bEnableEnables or disables line coloring.
bRedrawRedraws the chart.