Hi all,

I have as follows in Interface builder:

- A superclass with a @property NSOrderedSet *properties containing zero or 
more instances of objects, as well as some normal string properties. All the 
objects inherit from the superclass.

- An NSTreeController whose content object is bound to the selection of an 
NSArrayController. The NSTreeController is configured with the children key 
path "properties"

- An NSOutlineView whose content is bound to my tree controller's 
arrangedObjects. The outline view has two columns, each bound to a string 
property on arrangedObjects.

When I run my app, the outline view populates and changes its contents when I 
change the selection of the array controller. The columns show the string 
properties as expected.

However, no children are displayed and there is no disclosure triangle. I have 
verified with breakpoints that the tree controller does access my "properties" 
and that a set is returned with contents of the right objects. Likewise, 
changing the children key path to a non-existing property will yield a 
KVO-compliance exception.

I've read through the docs and spent some time googling, but nothing I've found 
has suggested a reason for the children to be missing.

What am I doing wrong?

Regards,

Mikkel
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