Hello John,
If you need to set the HtmlAttributes of the root element of the tree, it is supported in the latest internal builds. If you need per-node attributes, you need to use client-side templates and serialize the classes from the server. If you need help with implementing this in your specific scenario, please open a support ticket and send a sample solution that replicates the case.
Greetings,
Alex Gyoshev
the Telerik team
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