iPad SplitViewController with menu in portrait mode like settings app

This is the magic you need:

This method is in UISplitViewControllerDelegate, available on iOS 5.0

- (BOOL)splitViewController: (UISplitViewController*)svc shouldHideViewController:(UIViewController *)vc inOrientation:(UIInterfaceOrientation)orientation  __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0);
{
    return NO;
}