[xmonad] 'sink' on dmenu

Hi, I'm using this as my manage hook: mH = ( ask >>= doF . sink ) I don't understand much about X and xmonad. I read 'sink' clears the float flag from a window. However, some windows (like the one from 'dmenu') still do not appear as other windows managed by my layout. Of course, this is the way it should be. But I would like that all (even 'dlmenu') windows be managed by the layout manager. Is there, maybe, some other flag I should clear or set? Thanks, Maurício