Hi Jerry,
In your main window there is a method WD_DESTROY redefine that and rise the event which is like history trigger method.
if this is not working then create one overview page add your view set to that overview page and attach that over view page to window. implement the above method in window level.
just see this link
SAP CRM Technical Tutorials by Naval Bhatt.: How to set breadcrumbs in UIU Applications
Regards,
Srinivas.