Camillo and I deteremined that its probably a Nautilus bug that prevents
the "Code Rewriting" tools from working in Pharo 2 (I'm using 20606)
from within the browser (see
http://forum.world.st/how-to-use-RBClassRegexRefactoring-in-Pharo-2-td4695780.html).
�But in 1.4 you could use Omnibrowser & the Code rewriting tools.