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Error: "Sys is not defined" in RadEditor dialogs

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Article relates to

 RadEditor for ASP.NET AJAX
 Telerik.Web.UI

Created by

 Rumen Zhekov

PROBLEM
Error: "Sys is not defined" in RadEditor dialogs

SOLUTION
The problem is due to that the default ASP.NET AJAX handlers and modules are not registered in the web application's Web.config file. More specifically, the ScriptResource.axd handler is missing. Here are the httpHandlers needed for the RadEditor's dialogs to load and function properly:

<system.web> 
  <httpHandlers> 
    ...  
    <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false" /> 
    <add path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" validate="false" /> 
    <add path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" verb="*" validate="false" /> 
    <add path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" validate="false" /> 
  </httpHandlers> 
  <httpModules> 
    <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> 
  </httpModules> 
</system.web> 
<system.webServer> 
  <modules> 
    <add name="ScriptModule" preCondition="integratedMode" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> 
  </modules> 
  <handlers> 
    ...      
   <add name="ScriptResource" preCondition="integratedMode" verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> 
    <add name="Telerik_Web_UI_DialogHandler_aspx" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" /> 
    <add name="Telerik_Web_UI_SpellCheckHandler_axd" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" /> 
    <add name="Telerik_Web_UI_WebResource_axd" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" /> 
  </handlers> 
</system.webServer> 

See the following help article for more information about configuring ASP.NET AJAX - http://www.asp.net/AJAX/Documentation/Live/ConfiguringASPNETAJAX.aspx

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