Button color in Navigation bar - iPhone

Question

How do you to set the tint of this yellow button to be gray? I have tried adding an image, but have had no luck.

Here is the screenshot:

Answer 1

 UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
 [button setBackgroundImage:[UIImage imageNamed:@"button_main.png"]
                                       forState:UIControlStateNormal];
 [button addTarget:self action:@selector(GotoSettings)
              forControlEvents:UIControlEventTouchUpInside];
 button.frame = CGRectMake(x, y, x1, x2);

 UIBarButtonItem *menuButton = [[UIBarButtonItem alloc] initWithCustomView:menu];
 self.navigationItem.rightBarButtonItem = menuButton;

 [button release];
 [menuButton release];