You can take a look at Data Binding Overview
. You can drip SiteMapDataSource control on the same page and set the DataSourceID of the RadMenu control to the ID of the SiteMapDataSource.
The easiest option is using the default SiteMenu control. Actually you can see it source inside - Sitefinity/UserControls/Navigation35 folder of the website.
All the best,
the Telerik team
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