Flex change Image source dynamically by coding
private function loadImages():void
{
var source:String = "your dynamic image path";
var loader:Loader = new Loader();
var request:URLRequest = new URLRequest(pageSource);
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, loadCompleteHandler);
loader.load(request);
}
private function loadCompleteHandler(e:Event):void
{
var bitmapData:BitmapData = e.target.content.bitmapData as BitmapData;
var bitmap:Bitmap = new Bitmap(bitmapData)
image0.source = bitmap; // where image0 is your mxml file control
image0.validateNow();
}