On 2011 Sep 02, at 22:22, Trygve Inda wrote:

>> Briefly, you can configure the checkbox cell (either in IB or
>> programmatically) to have an action…

> I think this sounds like a much better option than trying to use KVO.

Indeed it is, *if* you literally want the notification, as you said in your 
original post, "whenever the user toggles a … checkbox".

However, if, as is more commonly the case, you actually need a notification 
whenever the 'marked' attribute in the data model changes, and if your 
application provides any other means by which that attribute could be changed, 
such as Undo, scriptability, business logic, or some other view of that 
attribute, which may be added in the future, then the shortcut of wiring to the 
control's action, although convenient, is going to be be missing these changes.

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