In Flex 3,we were able to use a background image and add child images to the background image and everything could zoom/scale in/out because the background image acted as a stage or collection of things on the screen. In flex 4, we can't add images to an image as separate images using addchild. I've tried to use a skinnable container, group or border container. I can add the objects but if I zoom, it doesn't seem to keep a transform x,y point to zoom to a certain point. What is best way to manage a collection of assets with dynamic X,Y points and states on a background image that is bigger than the viewport?