Hi Richard,
Sorry for the inconvenience caused.
I am afraid, I was not able to reproduce this issue.Could you please provide more information regarding your problem. Also, please send me a sample which reproduces the issue or modify the sample attached.This will help us investigate this issue accurately.
Here the respective ContextMenu is set to the respective treeViewAdv for the Form1 and Form2.
Thanks for your continued interest in Syncfusion products.
Kind regards,
Deepa.T.S
TreeViewAdvContextMenu.zip