No, as far as i know, at least with pse 11 on a windows machine.
You can however maximize the document window to cover the whole screen if your working with floating document windows on a windows machine.
You can also press the tab key, but unfortunaly in pse 11 that only gets rid of the tools panel (tool box) and panels on the right side of the screen and tool options/photo bin at the bottom.
Thanks! I am using a trial version of Elements and for some reason that really bothers me.. Things like that that make no sense really gripe me. haha