Problem with sound on a button in Flash 8

I am using Flash 8 Pro and trying to play an mp3 on hit in a button. Everything worked perfectly in Flash MX but in 8 the action script is not working.

Original script is

on (press) {
stopAllSounds();
}
on (release) {
play();
}

now I get a message

are permitted only for button instances
on (release) {

I even named the button instance and still doesn’t work. Any help would be appreciated.