Is there anyway to check for cross-database dependencies?

For example:
I have a stored proc in the Pubs database that contains a query that references a table in the Northwind database (as well as reference a table in the Pubs database.) I'm having no problems finding the depencency for the Pubs table. I can't seem to find the dependency for the Northwind table.

Any help would be appreciated.

Thanks in advance.

Scott