I'm sorry for the late reply. It looks like you've submitted this ticket for RadControls for Silverlight and the folks were unable to realize what's wrong on your end then asked us, the Test Studio team, for help. Thus the delay in our response.
I'm honestly not sure why would you get those compile errors. As far as I understand you have a Silverlight application running on top of RadControls, is that right? You're probably referring some RadControls assemblies but I checked your download history and it appeared you've downloaded Test Studio only. Perhaps a colleague of you has downloaded a RadControls for Silverlight package? Is that version 530?
Can you try adding your application in a new solution and try compiling that? Although I honestly don't know the reason for the problem I hope that will solve the problem. Please right back to share what's going on and any further details if you have.
the Telerik team
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