Hi,
There are basically two ways to initialize a hierarchical template - with HierarchicalDataTemplates or with DataTemplates and a TemaplateSelector. You can read more
here and
here and I've also attached a sample project which shows both approaches so you could examine it and see what works best for you.
If you have more questions feel free to ask.
Greetings,
Zarko
the Telerik team
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