Vertical navigation is once again popular on the web, particularly on data driven sites. In FileMaker, the typical navigation pattern is often a horizontal menu bar. Some developers incorporate vertical navigation in their systems with the use of a portal. Unfortunately, the portal alone is limited because it can only work on a form view; it doesn't work in a list or table view. The popover layout object in FileMaker Pro 13 can provide a more dynamic vertical navigation.
I've created two short screencast to demo this:
Download the demo file