As I managed to understand , you are making a ViewModel wrappers of the classes from your database and the bind the RadTreeView to the ViewModel. If you want to use the GetItemByPath or BringIntoView methods, you have to ensure that the tree's root level data is loaded, in other words the root RadTreeViewItems are already generated. You can use the ItemPrepared event which fires when a RadTreeViewItem is created. Please let us know if this helps you or not.
the Telerik team
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