Radtreeview not updating
Using the Expand Item By Path() method of the Rad Tree View class is a potentially expensive operation if the item is not visible.
If you need to do so, there is probably a better way to achieve what you need.
The event is not fired if the Selected Node property is changed programmatically.
For more information about how to handle events, see Handling and Raising Events.
The Rad Tree View API offers you the ability to expand an item by path programmatically.
In order to do this you should use the Expand Item By Path() method of the Rad Tree View.
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Workaround the issue by using the Begin Update/End Update methods of Rad Tree View when updating the nodes: rad Tree View1.