Series Title
You can add an individual title for Pie or Donut series views.
Initialize the PieSeriesView.Title property with an SeriesTitle object and specify its Content to add a title for the series:
<Charts:PieChart ...>
<Charts:PieChart.Series>
<Charts:Series>
<Charts:Series.View>
<Charts:PieSeriesView>
<Charts:PieSeriesView.Title>
<Charts:SeriesTitle Content="2001" Margin="10"/>
</Charts:PieSeriesView.Title>
...
</Charts:PieSeriesView>
</Charts:Series.View>
</Charts:Series>
</Charts:PieChart.Series>
</Charts:PieChart>