package  {
    import flash.display.*;
    import flash.events.*;

        public class Learning extends MovieClip {
            public var mc1:MovieClip = new MovieClip();

            public function Learning() {
                mc1.graphics.lineStyle(3);
                mc1.graphics.beginFill(0xff0000);
                mc1.graphics.drawCircle(200,200,50);
                stage.addEventListener(KeyboardEvent.KEY_DOWN, hideCircle);
                addChild(mc1);
                mc1.graphics.endFill();
            }

            private function hideCircle(e:KeyboardEvent):void {
                if(e.keyCode == 32) {
                    mc1.alpha = 0;
                } else if(e.keyCode == 8) {
                    mc1.alpha = 1;
                }
                stage.addEventListener(KeyboardEvent.KEY_DOWN, hideCircle);
            }
        }

}