Hi park,
Thanks for your interests in Syncfusion products.
Yes we have implemented a new method FindItemByPoint for TreeViewAdv. This method will find TreeViewItemAdv by Point using which you can achieve your requirements. We are sending you a simple sample for your reference. In the sample we have explained how to find the TreeViewItems by point using the Mouse Position in the PreviewDragOver event of the TreeViewAdv. Kindly download the sample from the following location.
http://files.syncfusion.com/support/Tools.WPF/7.2.0.20/Forum-82375/main.htmPlease let us know if you have any queries.
Regards,
Bala.