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NSTreeController and setSelectionIndexPaths

When setting a selection for an NSOutlineView using setSelectionIndexPaths on the view's controller object, the view is not updated with current selection. Setting the selection using selectRow on the view works fine, however. I suspect that the selection maintained by the view and the controller are not necessarily synced, but am not sure. Is there a way to force the view to update its selection from the controller?

Thanks.
-GH
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