RadControls for ASP.NET AJAX This topic shows how to register RadStyleSheetManager in DNN
1. Add the following code in the Page_Load event handler of the default dnn page:
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Form.Controls.Add(New Telerik.Web.UI.RadStyleSheetManager())
2. Add the following http handler in the web.config of your dnn web site:
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<httpHandlers>
<add verb="*" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource, Telerik.Web.UI" />