void CBCGPChartSeries::SetDataLabelUnderline	(	BOOL	bUnderline,
		int	nDataPointIndex = -1
	)

Sets data label underline option. Not compatible with "draw border".

Parameters

bUnderline	TRUE- underline a data label, FALSE - otherwise.
nDataPointIndex	Specifies a data point index. Use -1 to set the option for a series.