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// Display a right bar Close button item 
UIBarButtonItem *bbi = [[UIBarButtonItem alloc] initWithTitle:@"Close" style:UIBarButtonItemStyleBordered target:self action:@selector(doClose:)];    
self.navigationItem.rightBarButtonItem = bbi;
[bbi release];

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// Displaying a right bar info button item
UIButton *btn = [UIButton buttonWithType:UIButtonTypeInfoDark];
[btn addTarget:self action:@selector(doSomeAction:) forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *bbi = [[UIBarButtonItem alloc] initWithCustomView:btn];
self.navigationItem.rightBarButtonItem = bbi;
[bbi release];

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// Resize a UIButton according to its title's length.
CGSize stringSize = [self.myButton.titleLabel.text sizeWithFont:self.myButton.titleLabel.font];
CGRect frame = self.myButton.frame;
frame.size.width = stringSize.width;
[self.myButton setFrame:frame];