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I'm adding a MKUserTrackingBarButtonItem to a toolbar. This works fine on iPhone, but on iPad the button will only use the "plain" style. This makes it almost invisible on a black toolbar, so I want to use the bordered style. But even setting the item's style property to UIBarButtonItemStyleBordered makes no difference - it always renders on iPad as if using UIBarButtonItemStylePlain


Steps to Reproduce:
- Create a new single view iPad project
- Add the MapKit framework
- Add a map to the view, add an outlet to the ViewController
- Add a toolbar to the view, remove the button, add an outlet to the ViewController
- Configure ViewController's viewDidLoad as:

- (void)viewDidLoad
{
   [super viewDidLoad];
   MKUserTrackingBarButtonItem *userTrackingButton = [[MKUserTrackingBarButtonItem alloc]  initWithMapView:self.mapView];
   userTrackingButton.style = UIBarButtonItemStyleBordered;
   [self.toolbar setItems:[NSArray arrayWithObject:userTrackingButton]];
}

Set the toolbar to black opaque, and the problem should be clear: the button is almost invisible to the user, because it uses plain and not bordered style.


Expected Results:
It should look similar to the MKUserTrackingBarButtonItem on iPhone: http://i.stack.imgur.com/NomOi.png
And I know iPad UIToolbar can display bordered items, because it works for this manually created button:
http://i.stack.imgur.com/lbeQL.png


Actual Results:
It always displays as if it had UIBarButtonItemStylePlain: http://i.stack.imgur.com/hAiCc.png