What's the correct way of hooking into the *Dispose* invokation in classes
derived from *NSObject*?

I have an example in the gist here <https://gist.github.com/3146438>.
https://gist.github.com/3146438

This is the full IDisposable pattern as I've seen it declared in the MSDN
docs.  There's a lighter weight version in the comment below.

The problem is, NSObject implments IDisposable itself, and doesn't appear
to provide any overridable *OnDisposing* type methods.  I get a build
warning saying to use the "*new*" keyword on my Dispose method.

"new" is dangerous to use (right?).  If the object is cast as NSObject, and
Dispose is run - then the parent method will run, but my derived method
won't.  That's my understanding at least, please correct me if I'm wrong.

So what is the best practice for hooking into dispose in these types of
scenarios?  Thanks!

-- 
*Phil *Cockfield
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