can you please elaborate a little bit more on the exact use case scenario that needs to be implemented("I want to display each selected item like a tree view."
), so we can give you a more specific advice. Generally specifying the Custom Navigation option of the Navigation widget, would expect you to work with a custom datasource for that control. You can still utilize the built-in functionality of the Navigation widget and create a user control which generates the desired output, and then specify this control as a template for the Navigation widget in Sitefinity. Another option would be to create a user control from scratch which you can then register in Sitefinity and drop it on any page just like the built in Navigation widget, for that purpose you can base your control on RadTreeView and bind it to SitefinitySiteMapDataSource control. Please do not hesitate to let us know if this is not the desired functionality.
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