Why can't I add a ScriptManager or UpdatePanel control to a page in Visual Studio 2010?
Dragging (or double-clicking) just fails - does it seem like there's incompatibility somewhere?
UPDATE: This is the default installation of 2010 Ultimate in Windows7, creating a web application, cannot drag ScriptManager or UpdatePanel to the designer. Ad input is in progress.
The cursor changes to the [+] icon when you drag it to the desired location, but nothing happens when you click "drop", the document name is briefly added *, it quickly returns to its normal state, either saves or does cancel.
I suppose something is going wrong, so it cancels ... but what is wrong?
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