I am trying to implement an Observer object to send messages to objects on a form. The problem is that after I Subscribe my object to the Observer and then try to close the form on which the object exists, the form won't close. I assume this is because the Observer still has a reference to the object. I have tried releasing the object reference (from the Observer) in the objects Destroy method, but that didn't work. Where and how should the object "Unsubscribe"?