Did you have any luck with this?
Andrew, Not really sure why you would want to do this but I'll try to point you in the right area to look at. You are likely to break a lot of stuff trying to do this but I would look at the index.mxml which is the base spark application it has a child element that is the ViewerContainer. The ViewerContainer is just a mx canvas so I would put your hdivided box in the index.mxml and add the ViewerContainer to one of it's panels.
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