debug-config.xml

<?xml version="1.0"?>

<flex-config>
   <compiler>
      <debug>true</debug>
      <keep-generated-actionscript>true</keep-generated-actionscript>
      <optimize>false</optimize>
      <verbose-stacktraces>true</verbose-stacktraces>
      <incremental>true</incremental>
   </compiler>
</flex-config>