cell editing in tableview

Hi,I want to somehow stop my user when he tries to leave the editable cell of table view and tries to select any other control in my window. I have tried cellTextDidEndEditing. But it doesnt work if user doesnt edit the editable cell of my table view. I want to show a message box to user when ever the focus is about to change from my table view to some other control in my window. Do I need to subclass the NSTabelView and override resignFirstResponder and other responder methods. Please suggest..RegardsAbhijeetGet Yourself a cool, short @in.com Email ID now!