UML: Logically associating stuff with a package

[Oliver Kellogg <oliver kellogg sysde eads net>]

Hi,

I am just starting to use dia for UML diagrams and apologize
if this is a stoopid beginner's question:

How do I tell dia that classes are embedded inside a package?

(Physically placing them inside the package doesn't seem to
do the trick.)

Thanks,

Oliver