How to set default RenderMode for the entire application
Instead of having to assign RenderMode to each control on every page, you can just specify the mode in your web.config. Proper values are Auto, Classic, LightWeight, and Native.
<appSettings>
<add key="Telerik.Web.UI.Window.RenderMode" value="auto" />
</appSettings>
Home >
Programming > How to set default RenderMode for controls in Telerik Application