[Pharo-project] Removing a trait from a class

I can't remove a trait from a class using UI tools. (pharo 10050) How can I remove it programmatically ? Next with this same class, message from this trait are not reachable, the MNU is raised but the hierarchy is not right as IFIETayage1 is not a subclass of IFIExoMorph. However IFIExoMorph is using the same trait as IFIEtayage. It looks like there is mismatch in the classes with traits. (see screenshot) Now I realize my last istoa release suffer from this problem :) Hilaire -- http://blog.ofset.org/hilaire