I have a NSOutlive view that I would like to remove the toggle from some rows. The Zones and Assets rows are group items (header rows) and should not be collapsable. The problem is that is I answer NO
to - (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item
for these items, the toggles do go away, but then I can't programmatically expand then either.
Is there any way to remove the toggle from specific rows?