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WebDialogWindow and postback error


 Sorry my poor English...

 Exception in postback if web page include WebDialogWindow..

Error Message : Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request

I'm using ContentUrl in WebDialog.. html content from my extern url is render in self page, after load completed, any postback is fire exception Thanks..

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