Your Guide to Using the Grunge Template for Joomla
Gantry is, as a basic definition, a framework used for assembling, building and maintaining a RocketTheme template. It is an advanced platform for dramatically extending the capabilities of the entire theming system of Joomla.
Grunge has 6 preset styles in total, 3 of which are light variations and the other 3 are dark. Each variation has 3 background level combinations that are very subtle, and configurable via the Gantry enhanced administrator.
All you need to do is create a new Joomla menu module and assign it one of the header positions, header-b on the demo, and ensure Always show sub-menu items is set to yes.