CellTree

I am having a really really hard time trying to handle a CellTree that
can be changed by the user, eg adding and removing nodes. No matter
what way I try to get the tree to refresh I always bump into a missing
API.
Why is it for instance that I cannot seem to get a handle on the
children of a TreeNode (I am trying to save a tree state and then
restore it)??? Why is it not possible to use the Class
CellTreeViewNode which seems to provide a number of useful features,
etc...?
Given that these features are rather standard, at least for desktop
apps, eg JFace for instance, I am wondering if I am missing something
here. I would very much appreciate is somebody can help me out of
this.
Thanks

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