title: navigationItem.backBarButtonItem not working? Why is the previous menu still showing as the button?
body: <p>Trying to customize my back button in a drilldown navigation controller.</p>
  
  <p>On my one view controller I have an <em>Add</em> button where the code programatically generates a new <code>UIViewController</code>:</p>
  
  <pre><code>- (void)add:(id)sender 
  {
      MyAddViewController *addController = [[MyAddViewController alloc] initWithNibName:@"MyAddViewController" bundle:nil];
  
      [self.navigationController pushViewController:addController animated:YES];
  
      [addController release];
  }
  </code></pre>
  
  <p>This works and when I click the add button it drills down into the new view. Inside the <code>viewDidLoad</code> method of <code>MyAddViewController.m</code> I have:</p>
  
  <pre><code>self.navigationItem.backBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStylePlain target:nil action:nil] autorelease];
  </code></pre>
  
  <p>But this isn't working. The back button in the navigation controller remains the <strong>title</strong> of the previous view's controller on the stack. It seems that line does nothing. Did I miss something?</p>
  
  <p>Thanks</p>