Safari on iPhone. App style question

[rfApp]

I'm interested in developing a new app that has a similar design style as Safari (not a web browser app, but simply an app that has multiple views/controllers in this same style as Safari)

If you look at Safari, there's a BarButtonItem on the lower toolbar (on the right) that indicates multiple windows (or views). When you touch this button, the current view scales down by about 50%, and a delete symbol (little red circle with an "x" in the center) is added to the upper left corner of the scaled down window.

In addition, in this minimized mode, a new toolbar appears with a "New Page" button on the left, and a "Done" button on the right. When you touch "New Page", a new view is animated in and scaled to full screen.

Does anyone have any ideas on how this type of app is implemented ?

Any help is greatly appreciated !