domain relationships in shell / console

Hi,

I'm trying to investigate the properties of relationships between domain objects, using the groovy console or shell. I can't get it to load the associations though.

/* trimmed down to remove irrelevant fields and methods */
class Customer {
        String name
        Set sites
        static hasMany = [ sites : Site ]
}

$ grails shell
[...]
groovy:000> c = Customer.get(1)
===> Customer One

groovy:000> c.sites
[92288] hibernate.LazyInitializationException failed to lazily initialize a collection of role: Customer.sites, no session or session was closed
[snip massive stack trace]

I think I understand what's happening, but I need some code for the console that says "execute the following block in the context of a valid Hibernate session".

Thanks

Jon