| 
 | virtual | 
Returns a data point's label text.
The method is called to retrieve text of data label to be displayed for the specified data point.
You can override this method in a derived class if you implement virtual series and want to customize data point labels.
| nDataPointIndex | Specifies a data point index. | 
| content | Specifies data label content. | 
| strDPLabel | Contains data label text when the function returns. | 
Reimplemented in CBCGPChartTernarySeries.