[xmonad] never show infobars on certain workspace

hi! i'm looking for the method how to avoid showing infobars like dzenbar on a particular workspace. is it possible? if yes, could someone give concrete hints and recommendations how to implement it? i use xmonad-darcs and bars are spawned with the following lines: main = do myStatusBarPipe <- spawnPipe myStatusBar conkyBar <- spawnPipe myConkyBar