Back button Navigation bar transition.

Question

I created a uibutton that when the user taps it, it performs this action

-(IBAction) showMyViewController:(id) sender {

MyViewController *mvc = [[MyViewController alloc] initWithNibName:@"MyViewController" bundle:nil];
[UIView beginAnimations:@"animation" context:nil];

    [self.navigationController pushViewController: bmvc animated:NO]; 
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.navigationController.view cache:NO]; 
    [UIView setAnimationDuration:1];
    [UIView commitAnimations];

if ([self.navigationController isNavigationBarHidden])
    [self.navigationController setNavigationBarHidden:NO animated:YES];
[mvc release];
 }

The action flips like I want it to but the back button doesn't perform the the same animation. All it does push back the previous view when I want it to flipfromright. If you know how to do this please help.