Horizontal flip transition of a modal view with back button

gistfile1.m

//
//  SomeViewController.m
//
- (IBAction)doShowSomething:(id)sender
{
    UINavigationController *nav = [[[UINavigationController alloc]init] autorelease];
    MyViewController *av = [[[MyViewController alloc] init] autorelease];

    [nav pushViewController:av animated:NO];
    
    [nav setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];
    [nav setModalPresentationStyle:UIModalPresentationCurrentContext];
    [self.navigationController presentModalViewController:nav animated:YES];
}

//
//  MyViewController.m
//
- (void)viewDidLoad
{
    [super viewDidLoad];
    
    UIBarButtonItem *bt = [[[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStyleBordered target:self action:@selector(doBack:)] autorelease];
    
    self.navigationItem.rightBarButtonItem = bt;
}

-(IBAction)doBack:(id)sender
{
    [self dismissModalViewControllerAnimated:YES];   
}