[Pharo-users] how to use RBClassRegexRefactoring in Pharo 2 ?

Hi- In Nautilus when I try to use the 'Class Regex' menu item in Pharo 2 20605 I get an error that RBRegexClassRefactoring is an existing class in the system. In earlier Pharo versions you would select that menu item, make your changes, save them and then the refactoring would run. How do you do it now? Thanks Paul