BCGControlBar Pro for MFC
void CBCGPChartSeries::ShowMarker ( BOOL  bShow,
int  nDataPointIndex = -1 
)

Shows or hides a data marker for a specific data point, or for a whole series.

Call this method to show or hide a data marker for a specific data point, or for a whole series (if nDataPointIndex is -1).

Parameters
bShowTRUE- show data marker, FALSE - hide data marker.
nDataPointIndexSpecifies a data point index. Use -1 to set the option for a series.