title: Persistent rightBarButtonItem Property of UINavigationItem
body: <p>This may be a stupid question, but is it possible to keep a right <code>UIBarButtonItem</code> across multiple views managed by a <code>UINavigationController</code>? I have a progression of views that often share the same right <code>UIBarButtonItem</code>, but when I push a new view to my <code>UINavigationController</code>, I have to redefine the button every time, even if it hasn't changed. Mostly, the noticeable transitional animation from one view to the next is what bothers me because the exact same button briefly fades out then back in, which is unnecessary since there is no actual visual change. Should I consider just adding a <code>UIButton</code> as a subview of my <code>UINavigationBar</code> and accomplish a "right bar button" effect this way?</p>