How to debug framework in Flex 4 ?

Question

I want to debug in framework.swc file. But when I change the Link Type of the External framework.swc Framework linkage and select the Merged into code, then running the program:
<?xml version="1.0"?>
<!-- controls\alert\AlertSimple.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
   xmlns:s="library://ns.adobe.com/flex/spark"
   >
<fx:Script>
<![CDATA[
import mx.controls.Alert;
]]>
</fx:Script>
<s:VGroup>
<s:TextInput id="myInput"
width="150"
text=""/>
<s:Button id="myButton"
  label="Copy Text"
  click="myText.text = myInput.text;
  Alert.show('Text Copied!', 'Alert Box', mx.controls.Alert.OK);"/>
<s:TextInput id="myText"/>
</s:VGroup>
</s:Application>
it throw exception:
VerifyError: Error #1014: Class mx.core::UIComponent could not be found.
at flash.display::MovieClip/nextFrame()
at mx.managers::SystemManager/deferredNextFrame()[E:\dev\4.0.0\frameworks\projects\framework \src\mx\managers\SystemManager.as:267]
at mx.managers::SystemManager/preloader_preloaderDocFrameReadyHandler()[E:\dev\4.0.0\framewo rks\projects\framework\src\mx\managers\SystemManager.as:2460]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.preloaders::Preloader/timerHandler()[E:\dev\4.0.0\frameworks\projects\framework\src\mx \preloaders\Preloader.as:488]
at flash.utils::Timer/_timerDispatch()
at flash.utils::Timer/tick()
Can someone show me the way to to debug framework ?
P/s: I followed http://www.brightworks.com/flex_ability/?p=99 , but it's not help, too

Answer 1

External SWCs are native to the runtime (playerglobal.swc for Flash, airglobal.swc for AIR). The player error is telling you that UIComponent was not loaded which indicates to me that framework.swc is still marked as external. You indicated "changing" from external to merged. The default is actually RSL, so I'm not sure where that original setting comes from.
In any case, you can debug the framework without pulling the source into your project.
1) Navigate > Open Type
2) Find the framework class you want to debug
3) Set a breakpoint
4) Launch a debug session
Jason San Jose
Software Engineer, Flash Builder