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

Shows or hides a data label for a data point, or for all data points in a series.

Call this method to display a data label for a data point. If nDataPointIndfex is -1, data labels will be shown or hidden for all data points in a series (except those that have been formatted individually).

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