function flip( display:DisplayObject, orientation:String ):void {
 
       var m:Matrix = display.transform.matrix;
 
       switch (orientation.toUpperCase()) {
 
               case "HORIZONTAL" :
                       m.a = -1;
                       m.tx = display.width + display.x;
                       break;
               case "VERTICAL" :
                       m.d = -1;
                       m.ty = display.height + display.y;
                       break;
       }
       display.transform.matrix = m;
}
 
flip(logo, "horizontal");

http://blog.natebeck.net/2009/02/tip-of-the-day-flipping-display-objects/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+NateBeck+%28Nate+Beck%29

Flipping a DisplayObject

ActionScript 3