Hi David ,
Thanks for your interest in Syncfusion products.
Please refer the below sample that does not have any problem that you are seeing with TreeViewAdv. You can highlight the selection of the right clicking node by default.
Here is a sample that has a TreeViewAdv with MenuToolStrips , with default selection of right clicking node.
http://websamples.syncfusion.com/samples/Tools.Windows/F69916/main.htmLet me know if you have any questions.
Regards,
Nagaraj