ActionScript 3.0 :: Duplicate MovieClip Method - Making New Circle

I know AS3 doesn't have a duplicateMovieClip method anymore so how is this done? I tried the following with little success. Circle is a movieClip on the stage with instance name of circle. myEmptyClip is a movieClip in the library with the linkage set to myEmptyClip.

Code:
circle.addEventListener(MouseEvent.CLICK, makeNewCircle);
circle.buttonMode = true;
function makeNewCircle(event:MouseEvent):void {
var newCircle:myEmptyClip = new myEmptyClip();
newCircle.x = 300;
newCircle.y = 100;
addChild(newCircle);
}