Add my own custom tab on the Add Reference Dialog in custom project

I want to add my own custom tabs into the VS2012 Add Reference dialog for a custom project based on MPF library. I followed the Reference Manager Extensibility article on MSDN http://msdn.microsoft.com/en-us/library/hh873125.aspx and also the post "Showing"new" Add Reference Dialog in custom project" https://social.msdn.microsoft.com/Forums/vstudio/en-US/8fee46ca-f444-42c6-8d2b-42c9011f7805/showing-new-add-reference-dialog-in-custom-project?forum=vsx I use the IVsReferenceManager::CreateProviderContent to help create IVsReferenceProviderContext objects to return from GetProviderContexts, but the problem is how to develop my custom tabs.

To add a custom tab, seems it is necessary to implement an IReferenceProvider, an IVsReference, and an IVsReferenceProviderContext but there are no example how to do it.

Could someone please explain to me how to achieve this task ? (some snippet code could be very useful)

Thanks in advance

Nadia