Design Mode (VS.NET 2008), properties of the editor, uncheck all editmodes. A zero gets placed in the html (editmodes="0"). Then when you execute the page you get the following error
'EnumConverter' is unable to convert 'Telerik.Web.UI.EditModes' to 'System.ComponentModel.Design.Serialization.InstanceDescriptor'
Not sure why you would ever want to uncheck all of the editmodes, but i did by accecent and it was difficult to find out why i was getting that error.
Version: 2008.3.1125.35
'EnumConverter' is unable to convert 'Telerik.Web.UI.EditModes' to 'System.ComponentModel.Design.Serialization.InstanceDescriptor'
Not sure why you would ever want to uncheck all of the editmodes, but i did by accecent and it was difficult to find out why i was getting that error.
Version: 2008.3.1125.35