Running an iPhone 4 sized app on iPhone 5

[Gerry Orkin]

Hi all

I've been updating an iOS app already on the app store so it'll run in iOS 6. 

When I run the app in the iPhone 5 simulator the stack seems to resize to fill the new screen height instead of being centred at iPhone 4 size, which I understood is the intended behaviour with retina apps that have not been re-written to fill the height of the new screen size. 

Why is that happening? What am I missing?

Gerry