Sample project with a screencast is attached.
Stack trace:
JavaScriptStr.ApplyReplacement (DXR.axd?r=1_225…3,4_46,4_…:582)
Str.EncodeHtml (DXR.axd?r=1_225…3,4_46,4_…:595)
ASPx.CreateClass.UpdateStateObject (DXR.axd?r=1_225…4_46,4_…:31527)
ASPx.CreateClass.OnPost (DXR.axd?r=1_225…,4_46,4_…:4460)
(anonymous function) (DXR.axd?r=1_225…,4_46,4_…:3931)
ASPx.CreateClass.ForEachControl (DXR.axd?r=1_225…,4_46,4_…:3735)
ASPx.CreateClass.OnPost (DXR.axd?r=1_225…,4_46,4_…:3930)
(anonymous function) (DXR.axd?r=1_225…,4_46,4_…:3783)
(anonymous function) (DXR.axd?r=1_225…,4_46,4_…:3497)
ASPx.CreateClass.FireEvent (DXR.axd?r=1_225…,4_46,4_…:3612)
ASPx.CreateClass.ProcessPostRequest (DXR.axd?r=1_225…,4_46,4_…:5563)
aspxRaisePostHandlerOnPost (DXR.axd?r=1_225…,4_46,4_…:5682)
(anonymous function) (DXR.axd?r=1_225…,4_46,4_…:5591)
ASPx.CreateClass.FireEvent (DXR.axd?r=1_225…,4_46,4_…:3612)
ASPx.CreateClass.Before_WebForm_InitCallback (DXR.axd?r=1_225…,4_46,4_…:3892)
ASPx.CreateClass.DoBeginCallback (DXR.axd?r=1_225…,4_46,4_…:5145)
ASPx.CreateClass.CreateCallbackInternal (DXR.axd?r=1_225…,4_46,4_…:5191)
ASPx.CreateClass.AfterInitialize (DXR.axd?r=1_225…,4_46,4_…:4217)
(anonymous function) (DXR.axd?r=1_225…,4_46,4_…:3824)
ASPx.CreateClass.ForEachControl (DXR.axd?r=1_225…,4_46,4_…:3735)
ASPx.CreateClass.AfterInitializeElements (DXR.axd?r=1_225…,4_46,4_…:3822)
ASPx.CreateClass.InitializeElements (DXR.axd?r=1_225…,4_46,4_…:3803)
ASPx.CreateClass.Initialize (DXR.axd?r=1_225…,4_46,4_…:3785)
aspxClassesWindowOnLoad (DXR.axd?r=1_225…,4_46,4_…:5473)