Cisco 7945 phone/CUCM 7.1 changing position of displayed items for Directory button

When you press the Directory button on our 7945G phone you can see four options - Missed Calls, Received Calls, Placed Calls and Personal Directory. Almost no one uses Personal Directory and the more useful Corporate Directory has to be reached via scrolling down or knowing it's there in advance and pressing the number 5. I would like to swap the positions of 4. Personal Directory and 5. Corporate Directory. What's the mojo??