Samer,
Sorry I didn't catch your post earlier.
The first thing I noticed is that you are using an older version of PureMVC, you can download the latest version here:
http://puremvc.org/component/option,com_wrapper/Itemid,144/You can view release notes here to see what code changes you need to make to incorporate the update:
http://trac.puremvc.org/PureMVC_AS3/wiki/ReleaseNotesI updated your app on my copy, and I don't get the same problems, so I would suggest updating and see if that resolves the issue.