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Suppressing NSDocument's "unsaved changes" alert

This seems like it should be easy, but I can't find a solution. I have a document-based application in which each document (representing a project) manages its constituent source files in a manner similar to Xcode. When the user tries to close the document window or quits, they are (or should be) presented with a "Save All" window which lists any unsaved files (again, similar to Xcode).

The problem is that NSDocument's default alert panel always butts in, and I can't find a way to disable it. I've burrowed through the chain of methods called during window closing and application termination, but can't find any point at which I can choke this wretched little panel. Is there a way to do this, or am I going to have to go back and rewrite my application without the Cocoa document architecture?

Regards,
-Jeremy
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