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Non working dialogs when <xhtmlConformance mode="Legacy"/> is set in the web.config

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Article relates to

 RadEditor for ASP.NET AJAX
 Telerik.Web.UI

Created by

 Rumen Zhekov

PROBLEM
Non working dialogs when <xhtmlConformance mode="Legacy"/> is set in the web.config

SYMPTOMS
The following symptons or errrors could be caused by the <xhtmlConformance mode="Legacy"/> web.config setting:
  1. Blank managers
  2. Non accessible textboxes, dropdowns or other elements in the dialogs
  3. Error: Sys.WebForms is undefined

SOLUTION
The problem is caused by the following line in project's web.config file:

<xhtmlConformance mode="Legacy"/>

This setting is incompatible with ASP.NET AJAX controls (like RadEditor) and it should be removed. This setting could be added when upgrading an old project with Visual Studio.

You can find more information about the <xhtmlConformance mode="Legacy"/> setting in the following blog post: Don't use <xhtmlConformance mode="Legacy"/> with ASP.NET AJAX.

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