[flexcoders] Can not add a "Loader" object to a container

[anewgene]

Hi,
    I am trying to add external swf into my app. Based on the doc at:

http://livedocs.adobe.com/labs/flex3/html/help.html?
content=Working_with_MovieClips_8.html

I created this minimal test code (as below). But I can not make it 
work (Type Coercion error). The code and the error are pasted here. I 
have tested on both flex3beta2 and flex2hotfix3.

Can someone help me out? Thanks.

Lei

Code:
=================================================
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; 
layout="absolute" creationComplete="init()" >
                                          
        <mx:Script>
                <![CDATA[
                         import flash.display.*;
                         import flash.net.URLRequest;

                        private function init():void
                        {
                                var request:URLRequest = new 
URLRequest("http://flex.org/blogs/FlexOrgRSSApplication.swf";);
                                var ldr:Loader = new Loader()
                                ldr.load(request);
                                addChild(ldr);
                        }
                ]]>
        </mx:Script>
        
</mx:Application>

=========================================
Error:

[SWF] X:\cvs\test2\bin\loadertest.swf - 516,787 bytes after 
decompression
TypeError: Error #1034: Type Coercion failed: cannot convert 
flash.display::[EMAIL PROTECTED] to mx.core.IUIComponent.
        at 
mx.core::Container/http://www.adobe.com/2006/flex/mx/internal::addingC
hild()[E:\dev\flex_3_beta2
\sdk\frameworks\projects\framework\src\mx\core\Container.as:3288]
        at mx.core::Container/addChildAt()[E:\dev\flex_3_beta2
\sdk\frameworks\projects\framework\src\mx\core\Container.as:2248]
        at mx.core::Container/addChild()[E:\dev\flex_3_beta2
\sdk\frameworks\projects\framework\src\mx\core\Container.as:2188]
        at loadertest/init()[X:\cvs\test2\src\loadertest.mxml:14]
        at loadertest/___loadertest_Application1_creationComplete()
[X:\cvs\test2\src\loadertest.mxml:2]
        at flash.events::EventDispatcher/dispatchEventFunction()
        at flash.events::EventDispatcher/dispatchEvent()
        at mx.core::UIComponent/dispatchEvent()[E:\dev\flex_3_beta2
\sdk\frameworks\projects\framework\src\mx\core\UIComponent.as:8915]
        at mx.core::UIComponent/set initialized()[E:\dev\flex_3_beta2
\sdk\frameworks\projects\framework\src\mx\core\UIComponent.as:1118]
        at mx.managers::LayoutManager/doPhasedInstantiation()
[E:\dev\flex_3_beta2
\sdk\frameworks\projects\framework\src\mx\managers\LayoutManager.as:69
6]
        at Function/http://adobe.com/AS3/2006/builtin::apply()
        at mx.core::UIComponent/callLaterDispatcher2()
[E:\dev\flex_3_beta2
\sdk\frameworks\projects\framework\src\mx\core\UIComponent.as:8338]
        at mx.core::UIComponent/callLaterDispatcher()
[E:\dev\flex_3_beta2
\sdk\frameworks\projects\framework\src\mx\core\UIComponent.as:8281]