Hide disclosure icon for some nodes

Hi,
For some nodes with children, I would like hide the
disclosure icon; for some not.
How can I do that?
I tried disclosure._visible = false in the function
setValue(node, state) of my custom TreeRow Renderer extended from
mx.controls.treeclasses.TreeRow. It did not work though.
For other embedded moviclip in a tree, it seems I can
control, i.e. nodeIcon, cell.
Thx,
Guangming

Thanks, a case of missing the obvious
Extending HierarchicalData and overriding canHaveChildren and hasChildren worked.

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