Android Question JSON Tree as Tree View in a B4J Server App


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Is there anyone who built a simple Tree View function in a Server application B4J?
I'm trying to build on ' Json Tree Example ' in a B4J server application.
I discovered that a click on the root or child gave no event handling in the application.
What I want to accomplish is exactly as on the website -
The question is whether I'm on the right track or if I need to solve my ' treeview ' needs in a completely different way, if it is the right track what to do?