Debug a Silverlight application in a SharePoint WebPart

If you want to debug a Silverlitght Application in a SharePoint Silverlight web part read this article, it's really helpfull:
How to: Use a SharePoint Project to Deploy a Silverlight Application

SharePoint 2010 customErrors mode

Are you getting crazy getting no error details even if you allready set customErrors to Off on the web.config?

Just read this Post, I think it may help you out:

SharePoint 2010 customErrors mode

The secret lays here:

C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\TEMPLATE\LAYOUTS\web.config