Hello Thomas,
We have the following examples available on this topic:
1. Integration between ajax controls and Silverlight Upload -
http://demos.telerik.com/aspnet-ajax/upload/examples/silverlight/defaultcs.aspx
2. Integraion between ajax controls and Silverlight Charting -
http://demos.telerik.com/aspnet-ajax/chart/examples/silverlight/defaultcs.aspx
If you have any specific questions - we will be glad to help!
Sincerely yours,
Valentin.Stoychev
the Telerik team