title: UIBarButtonItem not showing up in UINavigationController
body: <p>I'm trying to add 2 buttons to a UINavigationController's navigation-bar: </p>
  
  <p>1) the standard "back" button on the left side - which works, and </p>
  
  <p>2) a "search" button on the right side - which does not show up.</p>
  
  <p>Here's the code:</p>
  
  <pre><code>-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
  
  // 1st button - this shows up correctly:
  UIBarButtonItem *backButton = [[UIBarButtonItem alloc] init];
  backButton.title = @"MAIN";
  self.navigationItem.backBarButtonItem = backButton;    
  
  // 2nd. button - this one does not show up:
  UIBarButtonItem *searchButton = [[UIBarButtonItem alloc]
                                             initWithBarButtonSystemItem:UIBarButtonSystemItemSearch
                                             target:self
                                             action:@selector(goSearching:)];
  self.navigationItem.rightBarButtonItem = searchButton;
  
  
  itemsByTitleVC *itemsView = [[itemsByTitleVC alloc] initWithNibName:@"itemsByTitleVC" bundle:nil];
  
  
  [self.navigationController pushViewController:itemsView animated:YES];
  </code></pre>
  
  <p>}</p>
  
  <p>anyone see why this isn't working?
  (For what its worth, I'm using Xcode 4.2, with Storyboard...)</p>