I have a windowController which swaps two views, a list versus a single 
record's detail view.
The detail view contains a hierarchy of arrayControllers which each support 
table views.  
At the top level of the detail view is an arrayController which contains the 
current selection from the list view. 
Each subordinate arrayController is bound to this top 
singleItemArrayController.selection.aDetailList array.

NSWindow
        ListView
                arrayController
                        objects

        DetailView
                singleItemArrayController
                        selection
                subordArrayController1
                        selection.subordArray1
                subordArrayController2
                        selection.subordArray2

This works fine to a point, but fails to clear the subordinate array 
controllers when the singleItemArrayController has no selection, or even just 
when it changes.

How ought I go about flushing the current selection content from the 
subordinate array controllers? 

- Erik
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