Dynamic Tree (RPC calls for nodes)

Hi.

I'm trying to implement dynamic tree.
During creation it contains only root node.
When I click open - it fetch nodes data via RPC call.

How I can pass information to which parent I should add nodes?
I defined AsyncCallback handler to parse response, but it has no
access to parent node.
I was trying to pass TreeItem object, but it's not serializable.

Regards
pksiazek

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