Here is a step by step guide on how to change your Mac OS X tabbing behavior:
- Open up “System Preferences”. If you don’t have it in your Dock, it’ll be in the Apple menu in the upper left corner of your screen. *Click on the “Keyboard & Mouse” icon in the second row titled Hardware.
- Click on the tab titled “Keyboard Shortcuts”
- At the bottom you’ll see something that says: “Full keyboard access: In windows and dialogs, press Tab to move the keyboard focus between:”. Click on the “All controls” radio button.
- Now enjoy your new tabbing freedom and tab to that Source List! Plus you can tab to more things in other Mac applications too. *Note that a shortcut to toggle this tab behavior globally is Control+F7.