Comment #2 on issue 918 by benjamin...@gmail.com: GLMTreePresentation display artifact when selection is set to an unexpanded node http://code.google.com/p/moose-technology/issues/detail?id=918
Actually that should be self containerTree changed: {#rootNodes. #openItemPath}, (self path collect: [:each | each item]) allButLast.
...except that introduces an issue of its own, not clearing the selection from the first line.