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Error after migrating AjaxControlToolkit 1.x to 3.5

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I'm getting this error after I migrated AjaxControlToolkit 1.0... to 3.5 recently:

Extender control 'AlwaysVisibleLoading' cannot extend 'UpdateProgress1'. Extender controls of type 'AjaxControlToolkit.AlwaysVisibleControlExtender' cannot extend controls of type 'System.Web.UI.UpdateProgress'

Couldn't get helpful references on this so far. Anyone?

asp.net asp.net-ajax ajaxcontroltoolkit
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