Código PHP:
    import     fl.controls.CheckBox
var xml:XML=
<contenido>
<url name="chec1">ico1.swf</url>
<url name="chec2">ico2.swf</url>
<url name="chec3">ico3.swf</url>
<url name="chec4">ico4.swf</url>
</contenido>
 
function createCheckBox(){
    for (var i:int=0;i<xml.child('url').length();i++){
        var checkBox:CheckBox=new CheckBox()
        checkBox.label=xml.url[i].@name
        checkBox.y=checkBox.height*i
        addEvent(checkBox,i,xml.url[i])
        addChild(checkBox)
    }
}
function addEvent(checBox:CheckBox,id:int,url:String):void{
    var loader:Loader=new Loader()
    addChild(loader)
    checBox.addEventListener(Event.CHANGE, upLoadDownLoad);
    function upLoadDownLoad(event:Event):void{
        if (checBox.selected) {
            loader.load(new URLRequest(url))
        }else{
            loader.unload();
        }
    }
    
}
createCheckBox()