Comment #1 on issue 839 by google....@ben.coman.com.au: ROCenteredLabel http://code.google.com/p/moose-technology/issues/detail?id=839
I just noticed the fileout didn't include the class definition. Probably obvious but for completeness...
ROLabel subclass: #ROCenteredLabel instanceVariableNames: '' classVariableNames: '' poolDictionaries: '' category: 'Roassal-Core'