Each UpdatePanel is in a ascx control, and these controls are added to he page programtically using Page.LoadControl().
When the client performs some UI actions in the browser, I am calling __doPostBack(). Each .ascx control will register client script block to be executed in it's UpdatePanel using ScriptManager.RegisterClientScriptBlock(), and each .ascx control uses a unique key when registering the script block.
I have tested this with both .NET 2.0 and .NET 3.5. I can produce a VS 2008 solution that demonstrates this problem. The only way for me to resolve this issue is to prevent multiple calls to __doPostBac
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