below is my very simple code to load images from a instance of button component
into an instance of UIloader component.

 there are multiple buttons like this one

 i can't get it... the way to get progress bar to listen and respond to the
loading of the image

 img_02_btn.addEventListener(MouseEvent.CLICK, onClick2);
 function onClick2(event:MouseEvent):void
 {
        trace("typeMe");
        loaderOne.source = "assets/b300.png";
        loaderOne.load();

 }