I am afraid RadChart does not support multiple labels. A possible workaround is to place the labels inside the pie and show only the values, while the detailed information is set to ChartSeriesItem.Name
. This way it will appear in the legend.
Here is how to place the labels inside the pie:
|<telerik:ChartSeries Name="Series 1" Type="Pie">
| <LabelAppearance LabelLocation="Inside">
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