A customized iOS control that provids the functionality similar to a UITabBarController, but this has a customizable vertical UI and follows iOS Container and Content View Controller programming guide http://developer.apple.com/library/ios/#featuredarticles/ViewControllerPGforiPhoneOS/CreatingCustomContainerViewControllers/CreatingCustomContainerViewControllers.html#//apple_ref/doc/uid/TP40007457-CH18-SW6