Background Color problems in New frames

I've only been using Emacs 21 or Mac OS X for a little while, but I'm 
pretty far along in hacking it.  However, I'm having some trouble 
keeping my background color correct.  The behavior I'm seeing is that 
the background color for areas without text is white, regardless of what 
I specify in the default.  However the background color for areas with 
text is what I specify.  I'm not sure whether it's emacs 21 or specific 
to the mac.  It seems to only happen in newly created frames, and it 
goes away if I specifically call (set-background-color)

Here's the code I'm using to specify the frame parameters:

(cond ((eq window-system 'mac)
        (setq default-frame-alist
	     '((mouse-color . "midnightblue")
	       (foreground-color . "midnightblue")
	       (background-color . "antiquewhite1")))
        ))

Thanks for any help,
-Steven


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