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CrossDomain SecurityException accessing my Azure WCF Service from Silverlight

Just uploaded a WCF Service Web Role to Azure with the intention of accessing it from a Silverlight web part, but I got the dreaded and almost expected:
System.ServiceModel.CommunicationException: An error occurred while trying to make a request to URI 'http://localhost:81/MyService.svc'. This could be due to attempting to access a service in a cross-domain way without a proper cross-domain policy in place, or a policy that is unsuitable for SOAP services. You may need to contact the owner of the service to publish a cross-domain policy file and to ensure it allows SOAP-related HTTP headers to be sent. This error may also be caused by using internal types in the web service proxy without using the InternalsVisibleToAttribute attribute. Please see the inner exception for more details. ---> System.Security.SecurityException ---> System.Security.SecurityException: Security error.
Yes, cool, but how do I add my crossdomain.xml or my clientaccesspolicy.xml files to an “Azure Web Role” which I just heard exists?

To my surprise it’s very easy you just have to add the XMLs to the project:

adding crossdomain.xml and clientaccesspolicy.xml to azure web role

Then you’ll be able to debug and, after you “Upgrade” the package in Azure Hosted service, you’ll be able to access it from Silverlight.

By the way, I don’t like "Upgrade" here, I find it misleading. I would have used Update.