title: Subclassing UIBarButtonItem
body: <p>I'm trying to make a subclass of the <code>UIBarButtonItem</code> class. The button is added in the nib file and I set its class to my custom class in the interface builder. Now if this was a <code>UIView</code> class or subclass I would have override the  <code>- (id)initWithCoder:(NSCoder *)decoder</code> method to start the extra customization, however <code>UIBarButtonItem</code> lacks such a method. I tried to override its <code>-(id)init</code> method but with no success, it doesn't get called. My question, where should I start my customization? What method do I need to override?</p>