Determining when a UILoader component resizes in Flash using ActionScript 3.0

// ActionScript 3.0
/* Requires:
 * - UILoader component in Flash library
 */
import fl.containers.UILoader;
 
var uiLoader:UILoader = new UILoader();
uiLoader.scaleContent = false;
uiLoader.addEventListener(Event.RESIZE, uiLoader_resize);
uiLoader.source = "http://www.helpexamples.com/flash/images/image1.jpg";
addChild(uiLoader);
 
function uiLoader_resize(evt:Event):void {
    var newX:uint = uint((stage.stageWidth - uiLoader.width) / 2);
    var newY:uint = uint((stage.stageHeight - uiLoader.height) / 2);
    uiLoader.move(newX, newY);
}