Hi Richard,
As Mike said, the only advantage you will get by using
RadWebBrowserElement is that you can add it at design-time in the
RadRotator's Items collection, using the Visual Studio designer. However, since you are using the programmatic approach, which is good enough in this case, you do not need the
RadWebBrowserElement.
If you have additional questions, feel free to contact me.
Regards,
Nikolay
the Telerik team