Well actually my English ain't that good also, I'm Portuguese ;D
Those 3 empty squares, actually ain't empty, they have the Alpha Channels edited, but you can't see it, if you don't know how to manage Alpha Channels ;D
Try searging inside Paintshop Pro's Help ot Photoshop, and search for Alpha Channels there, still I'm gonna try finding a tutorial for you, let me see if I can find something