Getting the URL of a model in Lift

Question

I'm coming at Lift from a Django point of view, so in Django parlence, I'm trying to find the Lift equivalent of reverse.

In generic terms, I have an instance of a model and I would like to get the URL that that model can be accessed at according to the SiteMap.

I've tried extending Loc, but that doesn't seem to have brought me further towards my goal.

I'm using the most recent 1.1 milestone (M8?).