Please bare in mind i'm running vers7 and not CS (yet...) but look to see if you have the palette turned on (viewable)

Look for it under the VIEW menu and see if there is a check mark on HISTORY - ACTIONS - TOOL PRESETS, if not select one of the group.

you should then see the palette on the right-hand side of your screen. this lets you move down your list of steps. you can set how deep you want your "history" to go in the "preferences", just remember, the more it needs to remember, the more RAM it needs...

:)
retrocity