Dynamic tree model change

[.:lexx:.]

Hello all. Last 2 days i spend trying to make dynamic tree model changing.
All i want is 4 actions - add node, remove node, move node up and move node down. Partically this functionality worked, but after change tree returns to its initial state - all nodes are collapsed and tree selection lost.
Does anybody have experience with similar cases of rich:tree usage?
How do you restore tree state after change?

[shmoula]

hi!
I'm trying to do similar thing, hou do you implement removing a node? I can remove node from data model, but when i refresh tree, it's still viewing