Based on this thread: https://www.telerik.com/forums/bind-style-based-on-selected-node I am able to get a selected node. Demos shown treeview bindings without ItemTemplate.
I use:
<TreeViewBinding IdField="Id" ParentIdField="ParentIdValue" ExpandedField="Expanded" TextField="Text" HasChildrenField="HasChildren" IconField="Icon" UrlField="Url" />
This results in a treeview with icons. How can I have the same result using an ItemTemplate?