I have a  tree node object with a function that adds nodes to itself
(as it is expanded).  I would like to do this on a worker thread, which
I do when I create the first level of nodes.

However, whilst Treeview has an invoke method, TreeNode does not appear
to.  Obvioulsy I need to call the invoke method of the TreeNode in
order to add the sub nodes on the same thread that the parent node was
created on.

Where is the invoke method of TreeNode?

treenode.nodes.add and invoke
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