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adding 'userdata' equivalent in script

I've loaded a tree using xml including the <userdata> tags that I use during a 'onclick' event.
I add a new node using script (tree.insertNewChild...). It works great.

Is there a way to add the equivalent of the <userdata> tags through script?

thank you

There are 
    tree.setUserData
    tree.getUserData 
commands , which can be used to set|get userdata on the fly

tree.insertNewChild(parent,new_id,....
tree.setUserData(new_id,"some_param","some_value")