As far as I understood you are trying to achieve functionality that will scroll to a node with attribute set to a specific value if that node is not in the current visible area of the RadTreeView control.
An easy and convenient way of achieving that functionality would be to use the RadTreeView node client-side object built-in method scrollIntoView. Here you may find more information about the RadTreeView node client-side object programming including the scrollIntoView method.
You may find here also a help article that shows a real life scenario example when you can scroll to a specific node on page load.
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