change parent of a node in a CellTree

Hi!

did someone already modify successful a celltree's structure
programmatically? I want to change the parent of a node
programmatically and see the changes displayed on the screen. What I
do now is the following:
• remove the considered node's value from the old parent's
ListDataProvider using ListDataProvider#getList()#remove ().
• add the considered node's value to the new parent's ListDataProvider
using ListDataProvider#getList()#add()
• call ListDataProvider#refresh on both old and new parent
ListDataProviders.

I expected to see the old node move from the old to the new parent.
But what occurs instead, is that the node I wanted to move just
disappear from the tree.
What can be the problem?

And I would also like to know, if there is a way to tell to a CellTree
to redraw itself because the backed data have changed.

Thanks for any help.
Rodrigue

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