UML class diagram in Intellij Idea 10.0.1

Hello,

I have seen great tutorial on uml class diagram topis recently (http://www.jetbrains.com/idea/training/demos/uml-class-diagrams.html)
and was surprised how handy this plugin is.

However,
I have some problems with using the uml class diagram.

I have a package structure, like "something.domain.*".
Package "domain" has own subpackages and classes. When I invoke Ctrl + Alt + Shift + U to display uml diagram
I can see all packages and clasess that are DIRECTLY in pckage "domain". BUT I am not able to expand subpackages to see which classes they contain.
I have tried select some subpackage and then press "e" but nothing happens.

Can you please provide me with instructions how to do this?
Have I missed something obvious? :)

Thanks.