Our WHMCS installation was setup to provide a seemless experience w/ the Joomla CMS. For various reasons, we decided not to use the "wrapper" (frame) functionality of Joomla. Instead we recreated the main site's template as closely as possible (w/ the aid of some embedded PHP code).
The drop-menus were also able to be re-created since the Joomla module that provides that functionality is build from a menu system that can be applied to any non-CMS site.
Additionally, the templating system and custom page integration provided by WHMCS has allowed us to begin developing customized tools for our clients inside the authenticated client area, keeping the client's experience in one place.
So here it is, main site:
http://lylix.net/
WHMCS (technically not connected to Joomla in any way; all accomplished with WHMCS template modifications):
https://customer.lylix.net/
Regards
