Containers need to consult child view controllers about rotation events

gistfile1.m

- (BOOL)shouldAutorotate {
    BOOL autoRotate = YES;
    for (UIViewController *vc in [self childViewControllers]) {
        autoRotate = autoRotate && [vc shouldAutorotate];
    }
    return autoRotate;
}

- (NSUInteger)supportedInterfaceOrientations {
    NSUInteger supported =  IPAD ? UIInterfaceOrientationMaskAll : UIInterfaceOrientationMaskAllButUpsideDown;
    for (UIViewController *vc in [self childViewControllers]) {
        supported &= [vc supportedInterfaceOrientations];
    }
    return supported;
}