Hello Hussein,
If I understand your scenario correctly you need to select the item that is added. If this is the case, then I'd suggest you to bind the
RadTreeViewItems IsSelected property to a business property from your view model.
This article demonstrates such an approach and I hope it will help you get started on implementing your requirements.
If you need more info, please let us know.
Kind regards,
Tina Stancheva
the Telerik team
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