[Pharo-dev] How to delete an obsolete class ?

Hi, In my project, my code has a strange behavior when I'm reading all subclasses of an another class. The following code must visit all the subclasses of PVEStatus but I get a bad result. PVEStatus allSubclasses do: [ :statusDatatype | (aRawStatus at: 'type') = statusDatatype type ifTrue: [ ^ statusDatatype getStatus: aRawStatus callback: self ] ] The answer contains #AnObsoletePVENodeStatus and this class doesn't exist. She doesn't appear in the class browser. I suppose that it's a rest of refactoring. How can I delete this obsolete class ? Best regards Olivier ;-)