Hello Per,
Basically, if EnableViewState is set to true, all RadWindows' properties that are set from the server will be saved in the viewstate and applied again on the next postback. I am not quite sure that I understand your setup completely however, so at this point I cannot tell whether there is a problem with that property or not. If you believe that there is a bug in this functionality, please open a support ticket and send us a sample project so we can investigate further. Of course if there is a problem, we will do our best to fix it right away.
Kind regards,
Georgi Tunev
the Telerik team
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