http://charles.lescampeurs.org/2011/02/10/tint-color-uibutton-and-uibarbuttonitem をとりあえずARC対応させた(autorelease抜いた)だけ

gistfile1.m

#define UIColorFromRGB(rgbValue) [UIColor \
colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 \
green:((float)((rgbValue & 0xFF00) >> 8))/255.0 \
blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]

- (void)viewDidLoad
{
    /* Create a tinted "UIButton" */
  UISegmentedControl *button3 = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:@"Add", nil]];
	button3.frame = CGRectMake(0, 0, 160, 33);
	button3.center = self.view.center;
	button3.momentary = YES;
	button3.segmentedControlStyle = UISegmentedControlStyleBar;
	button3.tintColor = UIColorFromRGB(0x0000DD);
	[self.view addSubview:button3];
    
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
}