Problem activating MAF add-in with custom AppDomain

I am trying to use the overload of MAF's AddInToken.Activate() method that accepts an AppDomain, so that I can pass an application domain created by my client application.

When the passed AppDomain is configured with unrestricted permissions it works fine, but if I reduce the permission set (for exampl开发者_开发百科e, by using the Internet sandbox permission set) MAF throws a SecurityException when performing the reflection necessary to discover its add-ins. Since the MAF assemblies are installed in the GAC, shouldn't they be fully trusted?

I know that MAF offers other method overloads that will create an AppDomain for me and allow me to specify the permission set assigned it, but I can't use this approach in my app, because I need to be able to specify the list of my own strong-named assemblies that will be given full trust.

Any suggestions?

Thanks,

Tim