title: UIBarButtonItem unclickable
body: <p>I try to create a view without using xib file.
  Unfortunately, I have problems early in my development.</p>
  
  <p>I just want to add a navigationBar and an OK button in it.
  Everything seems to be ok but in the simulator when I click on the button, nothing happens.
  The selector is not called and it seems also that the button is not reached (no change of the aspect).</p>
  
  <p>If you can have a look to my code, it would help.</p>
  
  <pre><code>-(void)loadView {
      //Set view background
      UIImageView * backView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:MM_BACKGROUND]] autorelease];
      [self setView:backView];
  
      //Set navigationBar
      UINavigationBar* navBar = [[[UINavigationBar alloc] initWithFrame:CGRectZero] autorelease];
      navBar.frame = CGRectMake(0, 0, 320, 44);
      navBar.tintColor = [UIColor clearColor];
      navBar.barStyle = UIBarStyleBlackTranslucent;
  
      UINavigationItem* navBarTitle = [[[UINavigationItem alloc] initWithTitle:@"My title"] autorelease];    
      UIBarButtonItem* backButton = [[[UIBarButtonItem alloc] initWithTitle:@"OK" style:UIBarButtonItemStyleBordered  target:self action:@selector(onTouchBackButton)] autorelease];
      navBarTitle.leftBarButtonItem = backButton;
      [navBar pushNavigationItem:navBarTitle animated:NO];
      [self.view addSubview:navBar];
  
  }
  </code></pre>
  
  <p>Thanks</p>
  
  <p>Maxime</p>