UISplitviewcontroller not as a rootview controller

Question

I am building my first iPad application. And one of my requirements is to deal with UISplitviewcontroller and UINavigationController.
our proposed view hierarchy is
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Answer 1

Try this, it works for me

1) in app delegate's didFinishLaunchingWithOptions make your login view to root view

self.window.rootViewController = self.loginViewController;  

also, init the split view as the template do ( but not add to self.window)

MasterViewController *masterViewController = [[[MasterViewController alloc] initWithNibName:@"MasterViewController_iPad" bundle:nil] autorelease];
UINavigationController *masterNavigationController = [[[UINavigationController alloc] initWithRootViewController:masterViewController] autorelease];

    DetailViewController *detailViewController = [[[DetailViewController alloc] initWithNibName:@"DetailViewController_iPad" bundle:nil] autorelease];
    UINavigationController *detailNavigationController = [[[UINavigationController alloc] initWithRootViewController:detailViewController] autorelease];

    self.splitViewController = [[[UISplitViewController alloc] init] autorelease];
    self.splitViewController.delegate = detailViewController;
    self.splitViewController.viewControllers = [NSArray arrayWithObjects:masterNavigationController ,detailNavigationController, nil];

2) add a swap view controller in app's delegate, which swap the root view to split viewcontroller.

-(void)swapToViewControllers:(RootViewControllerType)viewType  
        self.window.rootViewController = self.splitViewController; 

3) invoke the swapToViewControllers in your login view.