How can I get the selected documents of a 'threaded java view'?

I have an agent in the mail database which should work on all selected documents.The target of the agent is ‘All selected documents’ and with NotesSession.CurrentDatabase.UnprocessedDocuments I get all the selected documents.

But when the user expands a conversation thread and selects there in the thread some documents I cannot get the selected documents.

With NotesSession.CurrentDatabase.UnprocessedDocuments I get only the parent document of the thread.

Question: Is it possible to get all selected documents in a conversation thread with a ‘action menu selection’ agent?