I just ran into the same problem. I'm using the latest controls that just came out yesterday. I think I ran into this problem previously and forgot how I solved it. Setting the validation settings to none solved the problem. In my case, the problem was happening when I had a grid with in form editing that contained a combo box. In form editing worked fine if the form didn't have a combo box. The page also worked fine if I disabled AJAX for the grid. Also, I found that if I used model binding instead of advanced binding, the problem didn't happen. Thanks to the person that figured this out.
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