Page curl effect using CAFilter: how to draw on the back of the view ?

[Cesar]

Hi everybody,
I'm on an application that require the touch controlled page url effect, actually my code works very good on a single page.
I'm using the CAFilter, kCAFilterPageCurl.
Now I'm working on the double page view to fully emulate a real book but I don't know how to draw another view on the back of the curling one.

Question: How to draw a UIView on the back of another UIView ? ( or how i can obtain this effect )