On 5 Dec 2010, at 12:36, Peter Zegelin wrote:

> Found the problem!
> 
> I hadn't checked the 'Handles Content as Compound Value' checkbox in the 
> Array Controller Bindings. Switching this on and all now works.
> 
> 

The binding option being enabled here is 
NSHandlesContentAsCompoundValueBindingOption.

The documents at 
http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CocoaBindings/Concepts/MessageFlow.html%23//apple_ref/doc/uid/TP40002149
(points 15 - 22) documents the message flow.

The question is why is this necessary?
The NSArrayController in OP has no controller level transformer defined.

Regards

Jonathan Mitchell

Developer
Mugginsoft LLP
http://www.mugginsoft.com






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