Adobe Flash Builder (flex4): addChild() is not available in this class.

I want to load an swf into a flex 4 application in order to use its classes.

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var ldr:Loader=new Loader();
ldr.load(new URLRequest("file://path/to/fileswf"));
ldr.contentLoaderInfo.addEventListener(Event.INIT, loaded);
function loaded(evt:Event):void { addChild(ldr); }

I receive the error:

Error: addChild() is not available in this class. Instead, use addElement() or modify the skin, if you have one.

at spark.components.supportClasses::SkinnableComponent/addChild()[E:\dev\gumbo_beta2\frameworks\projects\spark\src\spark\components\supportClasses\SkinnableComponent.as:966]

at main/private:init/loaded()[C:\Documents and Settings\ufk\Adobe Flash Builder Beta 2\xpogames-toolkit-test\src\main.mxml:22]

If I change addChild() to addElement(), I receive the following compilation error:

1067: Implicit coercion of a value of type flash.display:Loader to an unrelated type mx.core:IVisualElement. main.mxml path/dir line 22 Flex Problem

Any ideas how to resolve this issue?

---

Create another container to place the displayObject in:

// container ( IVisualElement ) for DisplayObjects
var container:UIComponent = new UIComponent();
addElement( container );

// displayObject goes to container
var displayO:Sprite = new Sprite();
container.addChild( displayO );

---

well in flash builder 4 full version, there isn't any this.rawChildren.

The best approach to resolve the issue would be to convert each required class to a flex component and to use it on your flex application:

1. download and install flex component kit http://www.adobe.com/cfusion/entitlement/index.cfm?e=flex_skins

2. create a movie clip

3. convert to flex component

4. add the relevant functions to this class

a skeleton for a class that is attached to a movieclip that is about to be converted to a flex component:

package {
import mx.flash.UIMovieClip;
import flash.text.TextField;
import flash.events.Event;
import flash.events.MouseEvent;
public dynamic class challenge_screen extends UIMovieClip {

    public function challenge_screen() {
        super();
    }
}
} 

---

this.rawChildren.addChild( ldr ) should work

---

private var _loader:SWFLoader = new SWFLoader();
private var _uicomponent:UIComponent = new UIComponent();
private function swfLoaded(event:Event):void 
{
Alert.show("inside swf Loaded");
var content:DisplayObject =_loader.content;
_uicomponent.addChild(content);
} 
public function loadSWF () : void 
{   

_loader.addEventListener(Event.INIT, swfLoaded);
_loader.load("http://intelliveysoft.com:5080/myelearn/Admin.swf"); 
addElement(_uicomponent);
}

Try this. It will work