Navigation bar buttons not showing on real device

[efraimya]

I have a navigation bar with three buttons on the right (arrows for navigation + a sharing button). On the Iphone simulator I can see them well and they are working perfect. When I installed the app on a real Iphone 4 device the buttons are not shown at all!!! (my simulator is IPhone 3, if it metter). My code is:

UIToolbar *tools = [[UIToolbar alloc]
initWithFrame:CGRectMake(0, 0, 70.0f, 44.01f)]; // 44.01 shifts it up 1px for some reason
tools.clearsContextBeforeDrawing = NO;
tools.clipsToBounds = NO;
tools.tintColor = [UIColor colorWithWhite:0.305f alpha:0.0f]; // closest I could get by eye to black, translucent style.
// anyone know how to get it perfect?
tools.barStyle = -1; // clear background


NSMutableArray *buttons = [[NSMutableArray alloc] initWithCapacity:3];

// Create a standard refresh button.
UIBarButtonItem *bi = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"share.png"] style:UIBarButtonItemStylePlain target:self action:@selector(shareClicked)];
//initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:self action:@selector(refresh:)];
[buttons addObject:bi];
[bi release];

// Create a spacer.
bi = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"scroll left.png"] style:UIBarButtonItemStylePlain target:self action:@selector(upClicked)];
//bi.width = 12.0f;
[buttons addObject:bi];
[bi release];

// Add profile button.
bi = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"scroll right.png"] style:UIBarButtonItemStylePlain target:self action:@selector(downClicked)];
//bi.style = UIBarButtonItemStyleBordered;
[buttons addObject:bi];
[bi release];

// Add buttons to toolbar and toolbar to nav bar.
[tools setItems:buttons animated:NO];
[buttons release];
UIBarButtonItem *twoButtons = [[UIBarButtonItem alloc] initWithCustomView:tools];
[tools release];
self.navigationItem.rightBarButtonItem = twoButtons;
[twoButtons release];