From decompilation by Visual Studio:
public HtmlEditorWrapper AddClientEvent(string eventName, string eventHandler) { base.Model.AddClientEvent(eventHandler, eventHandler); return this; }
eventName is not passed
Assembly Infragistics.Web.Mvc, Version=5.21.1.7
Ensure that you pass the eventName parameter to the AddClientEvent method to make it work correctly. After making this modification, rebuild your project, and the issue should be resolved. rice purity test
eventName
AddClientEvent