 <p>Ari,</p> <p>A good reference to how to accomplish "invisible" instance variable declarations can <a href="http://cocoawithlove.com/2010/03/dynamic-ivars-solving-fragile-base.html" rel="nofollow noreferrer">be found here</a> with credit respectfully given to Matt Gallagher.</p> <p>Hope it helps, Frank</p>