_global crossdomain issue

Hi,
I was wondering if anyone has found a work around (ie. crossdomain.xml/sercuity setup.) for accessing _global properties when loading an external swf from a different domain?

It seems that using System.security.allowDomain() in both parent and child allows the clips to communicate via (_root, _parent, etc). However the _global properties can only be accessed by the clip in which they where created, not shared.

When the parent/child *swf’s are located in the same domain they have full access.

Any thoughts?