Sprite Kit and Texture Atlas

I’m having a look at SpriteKit, and having made something work on Xcode, I now want to do it with Fire/Oxygene.

How do I tell the compiler to create texture atlas, as in https://developer.apple.com/library/mac/recipes/xcode_help-texture_atlas/Recipe.html#//apple_ref/doc/uid/TP40013290-CH1-SW1 ?

I couldn’t see how to do it in VS either, so perhaps this is more of an Elements question?