Silverlight file uploader modalpopupextender, very slow performance

Apr 14, 2011 at 2:45 AM

http://silverlightfileupld.codeplex.com/

I am using this silverlight control with ajax modal popup extender, which works very good at the first time.  But when I hide it after popup, some scripts are running behind the scene, which makes the aspx page too slow.  Any suggestions to debug or fix this problem?