actionscript 3.0

spet rabim pomoc. problem nastane cisto pri simpl kodi, ki je ne znam oblikovati do konca.

stage.addEventListener(KeyboardEvent.KEY_DOWN, blabla);
stage.addEventListener(KeyboardEvent.KEY_UP, dada);

function blabla(event:KeyboardEvent):void
{
mojajapka.y -= 50;
}

function dada(event:KeyboardEvent):void
{
mojajapka.y +=150;
}

Kako hudica naj iz te kode naredim, da mi bo ob keyboard event cmd+f1 ali cmd+f2 ali katerikoli kombinaciji naredil spustno polje? prvi problem je torej how to make a combination in a keyboard event in drug problem je how to make hide&show-me-the-text if I press the combination?

any solutions?