Right now, if we set a corridor feature definition to "Top Mesh" only display and then label that mesh with civil labeler, the label will break if we change the corridor feature definition again. This makes it hard to use the civil labeler with a corridor. It would be awesome if the label would continue to pull the corridor information (mainly elevation in our case) even as the feature definition changes. Just because the top mesh isn't displayed shouldn't mean the underlying data goes away.