BCGSuite for MFC
void CBCGPChartSeries::SetDataLabelDisplayKey ( BOOL  bSet,
int  nDataPointIndex = -1 
)

Tells the data label display legend key.

Parameters
bSetTRUE - disaplay the legend key, FALSE - otherwise.
nDataPointIndexSpecifies a data point index. Use -1 to set the option for a series.