While not knowing the programming logistics behind it, typically in graphics work, you have to apply anti-aliasing as you paint to the image; you cannot take an image and make it anti-alised. (You *could* play with blur and other options to make it appear AA'ed, but this is probably not what you want). So if you drew additional text to the image at this point (after you set the AA property) I'd expect that text to be AA'd, but nothing else on the image.

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Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain
"I can see my house from here!"
It's not what you know, but knowing how to find it if you don't know that's important