[racket] Dialog with parent frame

When I assign a frame as a dialog's parent, the title of the dialog isn't
shown, but when I leave the parent as #f, the dialog shows up in the middle
of the screen even though the window may be in a totally different place.
Is there a way to have a frame as the parent and still have the title
displayed?

I'm running on OS X Lion and I just compiled from the latest source with
the default parameters.
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