I don't know the answer myself, but brainstorming, this is what I came up with:
(a) Find a direct workaround: e.g., see
http://www.mathworks.com/matlabcentral/newsreader/view_thread/27826
where in the last post on the thread someone claims you can render displays "invisible" and then save them to a file
(b) Play some kind of trick with X windows if you're on a Unix/Linux/Mac box. Something like using a virtual frame buffer. (I wouldn't know the details, this is rather a possible place to start.)
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