I am not sure I understand the OP's question, but the shortest answer seems to be to override the super class's designated initializer. http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaFundamentals/CocoaObjects/chapter_3_section_6.html http://developer.apple.com/documentation/Cocoa/Conceptual/ObjectiveC/Articles/chapter_13_section_3.html#//apple_ref/doc/uid/TP30001163-CH9-SW8 In the specific case requested, I don't think it is necessary to subclass NSCell or any of its descendants just to store extra data. See -setRepresentedObject: and -representedObject http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/Classes/NSCell_Class/Reference/NSCell.html#//apple_ref/occ/instm/NSCell/setRepresentedObject: The represented object can be anything including a dictionary of other objects. Categories can be used to preserve encapsulation when accessing a represented object... Even if there is a desire to have a represented object as well as arbitrary extra data, the "simulating instance variables" pattern along with a category will solve the problem: http://www.cocoabuilder.com/archive/message/cocoa/2004/12/4/123013 _______________________________________________
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