virtualTree, how to reset model?

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virtualTree, how to reset model?

slah
hello,
I'm trying to create an edit/insert window to edit selected item of a tree.
The problem is when I cancel edits, I'm enable to revert to old model values (see the __oldModel usage)

I've set up a playground example: http://tinyurl.com/zjdzycc

Can someone show me how to edit/insert row in a tree.