This Axure tutorial goes through basic interactions : how to show and hide widgets, groups and panels to simulate dynamic areas in a page.
After viewing this video, put your new skills to the test by re-creating the menu of the met site http://metmuseum.org . If you've followed the previous tutorials, you should already have a browsable wireframe with 4 pages in it. Use widget groups, visibility interactions and, dynamic panels to make a menu that behavves as closely as possible as the one on the original site.
In the next videos, I'll show you four techniques commonly used by UX practicionners to create menus.