UINavigation Controller and UITabBarController toggling

Question

Is it possible to do this?

In my appDelegate setup both a UINavigationController and a UITabBarController.

Initially my UINavigationController is added to the subview with a root view.

In my RootView when the user clicks on a certain button, it will remove the UINavigationController from the subview and will add a UITabBarController which will load another view?

Is this the correct way of doing things? or is it better to have my NavigationController push another view controller that has a UITabbarController attached to it?

Note: I need to have the UITabBarController because it allows the "More" functionality.