Hi Edward Sudit,
I already answered your other forum thread on the same subject. For convenience I am pasting my reply below. If needed, please, let's continue the discussion in the other thread.
The code that you posted is OK and is not raising such error on our side. I believe that the problem might be somewhere else on the page, but without having a better view over your case, I cannot tell for sure.
Please open a support ticket and send me a small sample project where the problem could be reproduced - I will check it right away and do my best to help you.
All the best,
the Telerik team
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