如何限制UITabBarController上的选项卡数量？

I have a working iPhone app with a UITabBarController. It all works fine. The app has more tabs than can be shown across the portrait width of the display, so we see 5 tabs in total (the last being the "more" tab). The thing is, we want to relegate some of the "less interesting" things to be behind the "more" tab. I know that if I had just 2 view controllers, then I'd see just 2 tabs, and so on until I exceeded 5 tabs.I have a working iPhone app with a UITabBarCont