change uibarbuttonitem background using image

i have an uibarbuttonitem, but i was initialize it using initwithcustomview. I want to change it backgrounds using an image, but i dont know how to do. I was using setBackground method, like this

NSArray *segmentText = [segmentTextMutable copy];
UIImage *image = [[[UIImage alloc] init] autorelease];
        image = [UIImage imageNamed:@"bunga.jpg"];
_docSegmentedControl = [[UISegmentedControl alloc] initWithItems:segmentText];
_docSegmentedControl.autoresizingMask =  UIViewAutoresizingFlexibleHeight;
_docSegmentedControl.segmentedControlSt开发者_如何学Goyle = UISegmentedControlStyleBezeled;
[_docSegmentedControl addTarget:self action:@selector(docSegmentAction:) forControlEvents:UIControlEventValueChanged];
[_docSegmentedControl setBackgroundColor:[UIColor colorWithPatternImage:image]];

but the uibarbuttonitem still not show the image, it's just change the segmented control background, not the barbutton. Can somebody help me?

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Perhaps you want to change the tint-color (@property(nonatomic, retain) UIColor *tintColor) because UISegmentedControl has no background-color (just because it inherits it from UIView does not mean it uses it though)