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
It's help me and I thank you very much about it
thanks Jason... I also had this problem..Class mx.core::UIComponent is a core class. So could't understand why this error even comes becuase mx.core should be included by default.
lot of head bagging
thanks for sharing your explanaition.