CS4 Quicktip: Pathfinder
While the Pathfinder functions themselves have not changed inside of Illustrator CS4, what has changed is their default behavior… and this might cause some confusion. In previous versions of Illustrator you could select two shapes and click a Pathfinder button to create a compound shape…

However if you perform the same steps in Illustrator CS4, you won’t get a compound, but an already expanded shape. In order to create compound shapes, just hold down the option (alt) key and click the respective button in the Pathfinder panel. Voilà…
