StockWatcher tutorial: change of user.theme has no effect

I am trying to follow the Changing the Theme step in the subject tutorial.

The tutorial is a bit behind the example code, as within the delivered Stockwatcher.gwt.xml (downloaded 2012/03/31) the uncommented theme is "Clean" which is not one of those shown in the tutorial. Regardless, when I comment the inherit of Clean and uncomment the inherit of Dark and   then cold start StockWatcher in Debug mode I see no visual change.

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