I had focus and it still didn't work. I did get F2 to exit to the BIOS setup by going into System Preferences / Keyboards & Mouse and changing the keyboard setting to use for F1, F2, etc. as standard function keys.
Having gotten past step 12 I found that when I got to step 17 my virtual hard disk was completed allocated to the 40GB and the Resize/Move button was grayed out. As such, it completely appears that all 40GB are now fully allocated.
In thinking about the 2nd instance (Virtual Machine) of XP or Vista, I'd think that I wouldn't be able to do anything with the Virtual Machine I was trying to expand because they are considered completely separate virtual systems.
In summary, I think I was able to allocate the remaining 20GB using Vista's Disk Management without using gparted.