I find the all purpose gluten free flours work great in baking that has a lot of natural moisture, like carrot cake, pumpkin loaf and banana bread. You add a little Xanthan gum with it for loft and a little extra liquid (like a tsp per cup of flour). So if your corn bread includes canned corn, like some I've seen, it should work just fine. If it doesn't, I've substituted all purpose flour with corn flour 1:1 with good success.