[chabapok]

попробовал. Теперь при запуске получаю такую простыню:

verify MainClass()
                        stack:
                        scope: [global Object$ flash.events::EventDispatcher$ flash.display::DisplayObject$ flash.display::InteractiveObject$ flash.display::DisplayObjectContainer$ flash.display::Sprite$ flash.display::MovieClip$ MainClass$] 
                         locals: MainClass * 
  0:getlocal0
                        stack: MainClass
                        scope: [global Object$ flash.events::EventDispatcher$ flash.display::DisplayObject$ flash.display::InteractiveObject$ flash.display::DisplayObjectContainer$ flash.display::Sprite$ flash.display::MovieClip$ MainClass$] 
                         locals: MainClass * 
  1:pushscope
                        stack:
                        scope: [global Object$ flash.events::EventDispatcher$ flash.display::DisplayObject$ flash.display::InteractiveObject$ flash.display::DisplayObjectContainer$ flash.display::Sprite$ flash.display::MovieClip$ MainClass$] MainClass 
                         locals: MainClass * 
  2:getlocal0
                        stack: MainClass
                        scope: [global Object$ flash.events::EventDispatcher$ flash.display::DisplayObject$ flash.display::InteractiveObject$ flash.display::DisplayObjectContainer$ flash.display::Sprite$ flash.display::MovieClip$ MainClass$] MainClass 
                         locals: MainClass * 
  3:constructsuper 0
                        stack:
                        scope: [global Object$ flash.events::EventDispatcher$ flash.display::DisplayObject$ flash.display::InteractiveObject$ flash.display::DisplayObjectContainer$ flash.display::Sprite$ flash.display::MovieClip$ MainClass$] MainClass 
                         locals: MainClass * 
  5:findpropstrict NewClass
                        stack: Object
                        scope: [global Object$ flash.events::EventDispatcher$ flash.display::DisplayObject$ flash.display::InteractiveObject$ flash.display::DisplayObjectContainer$ flash.display::Sprite$ flash.display::MovieClip$ MainClass$] MainClass 
                         locals: MainClass * 
  7:constructprop 3 0
                        stack: *
                        scope: [global Object$ flash.events::EventDispatcher$ flash.display::DisplayObject$ flash.display::InteractiveObject$ flash.display::DisplayObjectContainer$ flash.display::Sprite$ flash.display::MovieClip$ MainClass$] MainClass 
                         locals: MainClass * 
  10:coerce NewClass
VerifyError: Error #1014: Не удалось найти класс NewClass.

	at MainClass()