Creating a Stacked Area Chart
To create a stacked area chart you should set the C1Chart.ChartType property instead of the DataSeries.ChartType like the following XAML example:
<c1:C1Chart ChartType="AreaStacked" >
<c1:C1Chart.Data>
<c1:ChartData ItemNames="P1 P2 P3 P4 P5">
<c1:DataSeries Label="Series 1" Values="20 22 19 24 25" />
<c1:DataSeries Label="Series 2" Values="8 12 10 12 15" />
</c1:ChartData>
</c1:C1Chart.Data>
<c1:C1ChartLegend DockPanel.Dock="Right" />
</c1:C1Chart>