We add things to a live scenegraph all the time.  You just need to
attach a BranchGroup to a BranchGroup, set ALLOW_CHILDREN_EXTEND,
ALLOW_CHILDREN_WRITE (I think) to the upper BG and maybe ALLOW_DETACH
to the lower BG if you're going to remove it sometime later.  The lower
BG should be ready to go before you make it live. Things
just work.  No problems (except for ..., ..., ...)

-jds
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