There are two chart products for Silverlight - RadChart and RadChartView. You can find a thorough comparison in this help topic.
RadChartView is the newer component and it does not exist in the 2008.2.826 version, however, it addresses a lot of the shortcomings of RadChart and this is why we highly recommend it for any new development.
You can find examples of all currently supported chart types for RadChartView in the demo gallery and the chart types supported for RadChart here.
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