Hi Rich,
The fix for the NodeEditorValidating event issue has been included in our Release Candidate of v.4.2 (v.4.2.0.27) .And you can download the same from the following link:
4.2V DownloadLink
Else ,please create a Direct-Trac incident in this regard, and I will update you with the required link.And make sure to include the link of this forum post in your Direct-Trac incident.
Let me know if you need further assistance. Thanks for your interest in Syncfusion products.
Regards,
Deepa