The SiteMenu control ( RadMenu) is bounded to Sitefinity SiteMapData source. It shows all pages that you have already created. The control is styled by a css located under App_Themes/[one of the default theme]/Menu folder.
I suggest that you should take a look at RadMenu developers manual
to gather more information about the control and how it works.
If you are going to use RadMenu control there are two easy options that you can use to bind the menu to a data source
- Declare SiteMapDataSource control and RadMenu control in a user control. Then set DataSourceID property of the RadMenu to the ID of SiteMapDataSource control
- Work in Sitefinity UI, In one ContentPlaceholder drop RadMenu and DataSource control. Then Configure the DataSource for the RadMenu control in the same way as described in the lines above ( the diferrence here is that you are working in design mode)
the Telerik team