How do I set binding to a chart mapping's itemdatasource programatically?

[Douglas]

I found the sample to bind multiple datasources to a single chart, but how can I do this programmatically instead of in the XAML?

<charting:SeriesMapping LegendLabel="Vehicles in circulation" ItemsSource="{Binding DataSource2}">

[Douglas]

 BindingOperations.SetBinding(mapping, SeriesMapping.ItemsSourceProperty, new Binding("Datasource2"));

Where mapping is a new SeriesMapping()