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How to deal with : "...XXX is being deallocated while key value observers are still registered with it..."

This is in continuation to my earlier post What is the best way to use NSOutlineView without NSTreeController .

I managed to make it all work with NSObjectController and KVC class implementing "currentlySelectedObject" and "setCurrentlySelectedObject:" methods. Now I came to the point when I need to be able to delete objects from NSOutlineView. This is what I am getting when I am trying to do it:

XXX is being deallocated while key value observers are still registered with it

XXX is an object which used to be "currentlySelectedObject". All my attempts to disassociate this object with bindings failed so far. I have tried invoking "setCurrentlySelectedObject:" and making sure that "currentlySelectedObject" returns something else, it did not work. I have tried to set "content" of the NSObjectController to "nil" it did not work. I have tried to use "removeObject:" on NSObjectController passing XXX as an object or KVC object as an object, it did not work. So far I am out of ideas. Any help will be highly appreciated.

Thanks,
Andrei
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