Two or more UIButton on UINavigationBar

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

UIButton * button1 = [UIButton buttonWithType:UIButtonTypeCustom];
        [button1 setFrame:CGRectMake(0.0f, 0.0f, 25.0f, 25.0f)];
        [button1 addTarget:self action:@selector(firstMethod:) forControlEvents:UIControlEventTouchUpInside];
        [button1 setImage:[UIImage imageNamed:@"first-button.png"] forState:UIControlStateNormal];
        UIBarButtonItem * buttonItem1 = [[UIBarButtonItem alloc] initWithCustomView:button1];
    [buttons addObject:buttonItem1];

UIButton * button2 = [UIButton buttonWithType:UIButtonTypeCustom];
        [button2 setFrame:CGRectMake(0.0f, 0.0f, 25.0f, 25.0f)];
        [button2 addTarget:self action:@selector(secondMethod:) forControlEvents:UIControlEventTouchUpInside];
        [button2 setImage:[UIImage imageNamed:@"second-button.png"] forState:UIControlStateNormal];
        UIBarButtonItem * buttonItem2 = [[UIBarButtonItem alloc] initWithCustomView:button2];
    [buttons addObject:buttonItem2];

    float barWidth = button1.frame.size.width + button2.frame.size.width;
    UIToolbar* tbar = [[[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, barWidth * 1.5, 44.01)] autorelease];
    [tbar setItems:buttons];

UIImage *imgBack = [UIImage imageNamed:@"image-back.png"];
    UIImageView *tbarBg = [[[UIImageView alloc] initWithImage: imgBack] autorelease];
    tbarBg.backgroundColor = [UIColor redColor];
    [tbar insertSubview:tbarBg atIndex:tbar.subviews.count == 0 ? 0 : 1];

    self.navigationController.navigationBar.topItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:tbar];