sharedelements

Shared elements in Visio across files

Hi there,

I can't figure out how to share a background across multiple files
in Visio. Our team is using a source control program so we want to
have each wireframe in it's own Visio file. I want to have the
template background in another file, but if I update the background,
I don't want to have to go change every page. It's like a server
side include, or "instance"

Any ideas?

Thanks
JR