BCGControlBar Pro for MFC
void CBCGPChartSeries::SetMarkerShape ( BCGPChartMarkerOptions::MarkerShape  shape,
int  nDataPointIndex = -1 

Sets marker shape either for all data points in a series, or for specified data point.

Call this method to set data marker shape. The shape can be one of the following enumerated values:

shapeSpecifies the shape.
nDataPointIndexSpecifies a data point index. Use -1 to set the option for a series.