Comment #4 on issue 612 by tudor.gi...(a)gmail.com: [Glamour] Tags do not
play well with trees
http://code.google.com/p/moose-technology/issues/detail?id=612
The problem is in the Morphic rendering of Glamour: in GLMTreeMorphModel
and GLMTreeMorphNodeModel. Specifically,
GLMTreeMorphModel>>toggleFilteringByTag: is the root of the algorithm that
should decide which nodes should be visible and which should not.