Using the AjaxControlToolkit.config file from the ASP.NET Ajax Toolscriptmanager page:
<ajaxControlToolkit>
<controlBundles>
<controlBundle>
<control name="AccordionExtender"></control>
<control name="CalendarExtender"></control>
<control name="HtmlEditorExtender"></control>
</controlBundle>
</controlBundles>
</ajaxControlToolkit>
Generates the error message 'AjaxControlToolkit is not declared'. Don't know where or how to declare it.