Celltree - Add, Update, Remove Nodes

Hey all,
I try to implement an example with an Celltree with some basic
functions
like add, update and remove some nodes.

It seems that this basic functionally is very tricky. I tried it with
an hashmap to store the Node/Dataprovider an the corresponding object.
If I select an object in my celltree I search for the dataprovider in
the
hashmap and add/remove the new node to this dataprovider.

Additionally I have to refresh the dataprovider from the new node and
the parent.

My solution is not working very well and doesn't looks very nice.

I searched for this topic but I didn't found a good/easy solution.

Is there no smart solution for that because this is a very basic
funtionallity and
lot of people must have this 'challenge'?

Has anybody a running small example how to add/remove dynamically
nodes?

I'm using GWT 2.4.

Thanks a lot for any help!
Marco

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