MovieClip.prototype.disableAllButtons = function(act) {
        for (var counter in this) {
                if (this[counter].__proto__ == Button.prototype) {
                        this[counter].enabled = act;
                } else if
                (this[counter].__proto__ == MovieClip.prototype && this[counter]._parent == this)
                {
                        this[counter].disableAllButtons(act);
                }
        }
};
ASSetPropFlags(MovieClip.prototype, "disableAllButtons", 7);

disableAllButtons(false); //
disableAllButtons(true); //
myMC.disableAllButtons(false); //