We are currently testing our controls against the Silverlight 5 RC. There are some issues that we found and some of them are major like the one in the thread you send. We will definitely work on resolving them, but in the moment I can't give you a specific time frame when there will be stable version compatible with Silverlight RC. But I can assure you that we are tightly following Microsoft releases and will try to provide compatible controls as soon as possible.
Don't hesitate to contact us if you have further questions
the Telerik team
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