Hi, as we know in Smalltalk we use the concept of "messages" even to create new classes. Beside the regular #subclass:instanceVariableNames:classVariableNames:category: message there are other flavours and one even can implement such methods on his own easily. Just wondering: Is it easily possible already that one can define (for instance for a common superclass) that Nautilus displays the custom class creation message when a class is clicked: Something like: HTMLTag subclass: HTMLAnchorTag tagName: 'a' category: 'HTML-Markup' HTMLTag subclass: HTMLFormTag tagName: 'form' category: 'HTML-Markup' ... Animal subclass: Cat genome: 'Felis catus' category: 'Pets' I guess that would be highly useful for own custom DSL's and make modeling the real world in standard Pharo tools like the browser even more attractive. Any comments, use cases or code? Thanks T.