How to add a leftBarButtonItem to ABPeoplePickerNavigationController?
<p>Tried this, but doesn't work:</p>

<pre><code>ABPeoplePickerNavigationController * people_picker = [[ABPeoplePickerNavigationController alloc] init];

people_picker.peoplePickerDelegate = self;

self.navigationController.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle: @"send" 
       style: self.navigationController.navigationItem.rightBarButtonItem.style
      target: self
      action: @selector(cancelAddressBook)] autorelease];

[self.navigationController presentModalViewController: people_picker animated: YES];
</code></pre>
