update Panel is not working in SharePoint Server 2010 Production environment

Dear All,
I've a web part having on it an update panel containing Ajax tab container, the problem is the TabContainer_ActiveTabChanged event is not firing on the production environment, while everything work great on the test environment.
I've searched over the internet, and I found this link
But I can't find this dll.
Technologies used:
1-  SharePoint Server 2010
2-  Visual studio 2010
So any help would be appreciated, thanks
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RamzyNEbeidAuthor Commented:
it is now working, we added the this webpart that is using update pannel in WebPart Page on sharepoint not normal page
and now it is working very good.


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RamzyNEbeidAuthor Commented:
i found the solution
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