Thanks,

I don't currently have leaf/count configured. They are empty in IB - my 
impression was that they were optional and for performace?

Mikkel

On 14/05/2012, at 10.06, Quincey Morris <[email protected]> 
wrote:

> On May 14, 2012, at 00:40 , Mikkel Eide Eriksen wrote:
> 
>> - An NSTreeController whose content object is bound to the selection of an 
>> NSArrayController. The NSTreeController is configured with the children key 
>> path "properties"
> 
> 1. Check that you have the correct configuration for the count key and/or the 
> leaf key.
> 
> 2. Check the KVO compliance of whichever of these keys you use. For example, 
> a leaf key like this:
> 
>       - (BOOL) isLeaf {
>               return self.properties.count > 0;
>       }
> 
> *isn't* KVO compliant.
> 
> 
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