[AS3] Changing alpha doesn't work?

programming flash
1

I am trying to change the current day’s movieclip alpha to 75% but it doesn’t seem to be working. I have included the complete class in the attachment.


        public function getDay(event:Event) {
            //day_mc.x=35;
            //day_mc.visible=false;
            //day_mc.height = 25;
            //day_mc.width = 25;
            day_mc.alpha = .75;
                    
        }