Moved to mac 2 days back. But i have some issue. The Left Command button when pressed is working as the way the expose' works. I want to use this command button for executing various other commands like( New tab, new window etc). But when i click on this Command button the screeen is shown as thumbnails and i was not getting the desired functionality of the Command button.. com+T, com+N etc. How do i make the command button work for the combination commands?