Hi Karlkim Suwanmongkol,
By default, the chart legend gets the name of the data series from the DataSeries.LegendLabel
property when you manually populate the chart control. In data binding scenarios it is the SeriesMapping.Legendlabel
which holds the legend label.
When using the grouping and aggregation functionality of RadChart the series are auto generated with legend label matching the value on which the data has been grouped.
Hope this will help.
the Telerik team
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