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first I can't see a connection between the title and the content of your post, So I'll just concentrate on the content.

I am not entirely sure what you try to achieve so before I try to provide the wrong example can you please confirm I understood you correctly:

Do you want to replace an existing leaf-node in a tree with a tree-node that is not a leaf? And want to make sure it is inserted at the same position? Or what do you need the path for? Does ContactTreeNode extend DefaultTreeNode?

did you have a look at the dynamic tree example

first I can't see a connection between the title and the content of your post, So I'll just concentrate on the content.

I am not entirely sure what you try to achieve so before I try to provide the wrong example can you please confirm I understood you correctly:

Do you want to replace an existing leaf-node in a tree with a tree-node that is not a leaf? And want to make sure it is inserted at the same position? Or what do you need the path for? Does ContactTreeNode extend DefaultTreeNode?

did you have a look at the dynamic tree example ?