Computer Graphics Bulletin Board

well you know how there are 3 boxes that pop up? i only have 2. the picture one then the tool one. i clicked the x on the background thingy one and now it wont pop up or even show. i tryed downloading it again but still nothing. how can i get it to show again?

try:
Windows: Recently Closed Docks: Layers, Channels, Paths . . . .