I use an iMac but to use PTE I use VM Ware Fusion4 to enable me to use Windows and also use PTE. When I move the slides down from the tree into the list, I want to be able to sort my pictures by way of a Lightbox. I have read that to so this you press F4 but when I do this on my Mac keyboard it goes to Dashboard. How can I access Lightbox? Regards David