A custom back button with a dismiss.

custom-back-button.m

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    AppListingAppDelegate *appDel = (AppListingAppDelegate *)[[UIApplication sharedApplication] delegate];
    User *user = (User *)[appDel.users objectAtIndex:indexPath.row];

    if (self.userView == nil) { 
        UserViewController *viewController = [
            [UserViewController alloc] 
            initWithNibName:@"UserViewController" bundle:[NSBundle mainBundle]
            ];

        self.userView = viewController;
        [viewController release];	
    }

    self.userView.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
    [self.navigationController presentModalViewController:self.userView animated:YES];
    self.userView.backButton.title = [user username];

    UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Back"
                                                               style:UIBarButtonItemStyleDone
                                                               target:self                                                                             
                                                               action:@selector(handleBack:)
    ];

    self.userView.backButton.leftBarButtonItem = backButtonItem;
    [backButton release];

    self.userView.title = @"User View Title"
}

- (void)handleBack: (id)sender {
    [self.navigationController dismissModalViewControllerAnimated:YES];
    return self;
}