Magazine App Concept - Problems & Suggestions

Hello,

I am trying to build a magazine app like Sports Illustrated's one. You can see it @ "http://www.youtube.com/watch?v=U3j7mM_JBNw"

I have some problems implementing the Page Viewer. They use a TabBar Controller to run a scrollView with the thumbails of the pages (min. 1:40). How can i build a TabGroup with a new window (or a view) to emulate like they do? I can't run a window in background with the html pages and open a new window with the ScrollView and the thumbails inside (pageViewer's window overlaps my main_window).

Any idea/suggestion? Thanks :)