>The work arounds (I've tried a list of them including the 2 listed here) don't seem to work if you have a listbox inside a container on a page.

this work for me:

* start properties
container.Visible = .F.
container.listbox.Visible = .F.

container.UIEnabled(lEnable)
This.Visible = m.lEnable

container.listbox.UIEnabled(lEnable)
This.Visible = m.lEnable