ForEVER I've been annoyed with tooltips in Flash. Yeah, I've turned them off in preferences, but that doesn't effect the ones in the ActionScript area. I've gone so far as to globally and specifically set tooltips to a delay of 60 seconds in my Mac terminal, effecting every application in my system, but this f^%king program over rides even that. Enough, already! These things are like *******' flies jumping up in front of my screen.
If you are talking about the code hints in the Actionscript window there should be an option to enable/disable them in the Actionscript section of the Preferences... this is different from the Show Tooltips option in the General section.