TREE, how to get the ITEM of a cl_column_tree?

Hi guys!
I built my column tree with 2 columns so far for equipments.
the equipment id  has 18 char, the node-node_key only 12.  So i decided to put the equipmentid in an item_text.
My question now is,
How can i access these items in the method HANDLE_EXPAND_NO_CHILDREN....the events gives me the node_key, but how can i get to the item?
thanks

Thanks a lot for all your answers! :)
I finally got to do something with my little knowledge =P
I created a new class containing all the data needed for the dataTable (including a "String id").
And that's what I get:
<h:column>
     <a:commandLink
          value="#{familyAction.familyDocsByPrj.name}"
          action="#{homeAction.search(familyAction.familydocsByPrj.id)}"
          reRender="rightAppPanel" />
</h:column>

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