Through Sitefinity User Interface you could manage the control properties, but the user should know what he/she does. Using Sitefinity Site Menu control you don not need to bind it to SiteMapDataSource( it is done by default). In case you want to add RadMenu, you need to bind it.
You can gather more information about how controls work in Sitefinity form our demo website http://demo.sitefinity.com/Home.aspx
I hope this helps.
the Telerik team
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