I have two UITabBarControllers in my mainwnidow.nib wired to my appdelegate.

In my app delegate, I can load either one:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

//either
     [window addSubview:tabBarController.view];
//or
     [window addSubview:tabBar2Controller.view];
[window makeKeyAndVisible];
}

and autorotation works.

If I add both (with the expectation to swap between them later):

 [window addSubview:tabBarController.view];
 [window addSubview:tabBar2Controller.view];

then autorotation stops working...everything is always portrait.

Thanks in advance for any tips...