Hi Eugene,
Thank you for your interest in Syncfusion Products.
It is possible to set the TreeNodeAdv to edit mode programmatically using BeginEdit()method. Please refer to the code snippets and the sample provided below:
this.treeViewAdv1.BeginEdit(this.treeViewAdv1.SelectedNode);
http://files.syncfusion.com/support/Tools.Windows/7.1.0.30/F80143/main.htmPlease try this and let me know if any concerns.
Regards,
Fathima