Hi Richard,
Thank you for using Syncfusion products.
We can enable or disable node editing using IsEditable property of TreeViewItemAdv. We have prepared a sample to demonstrate the same, and in that we have bound the CanEdit property of TreeModel class to IsEditable property through ItemContainerStyle property of TreeViewAdv. You can download the sample from following link:
Sample:
TreeViewAdv_EditableRegards,
Jessie