Sharepoint | Instalar webpart com ajax / ajaxcontrol tookit

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este erro é comum e conhecido por muitos...

... a resposta? ainda não tenho

"Extender controls may not be registered after PreRender."



este erro não foi resolvido e desisti de usar ajax por estas e outras razões.

mas já houve quem conseguiu:
http://forums.asp.net/t/1061827.aspx

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