Panels tabs are (like so many things in Drupal) pretty easy once you know the exact steps. Using Drupal 7.20, Panels version 7.x-3.3, Ctools 7.x-1.2. you can make a page that has horizontal tabs along the top. It doesn't require any additional modules.
- 1. Create a panel for the first tab. I called it tt1. You do this by navigating to admin/structure/pages and add a custom page.
- set admin title to tt1 & Set path: set to tt1/concepts
- select a layout eg. columns1 and select radio button for Columns 1
- use the default panel settings
- For Title put Concepts & add some content to the middle column so you have something to see when you land on that page
- select menu and select Default menu tab - follow the image below for the rest of the settings
Optionally add a parent menu item called tt1 on the main menu. This will make a main menu item to get to your tabbed panelsThis doesn't seem to be necessary any more 6-24-14
- Add a second panel page tt2. This will hold the content for the second tab. This is NOT the same as adding a variant.
- Set the path to tt1/software
- For the menu option, select menu tab,
- Set it's title to Software
- Add a third panel page tt3.
- Set the path to tt1/examples
- For the menu option, select menu tab (like on page tt2)
- Set it's title to Examples
- Go to the url tt1/concepts and you will see the tabs at the top. This is very similar to the process in Views.