I'm implemented a new ToolRegistry class, which can work as replacement of ToolSet. It would require a 'bit' refactoring, to replace all references to 'ToolSet' with 'Smalltalk tools'. What i discovered during implementation, if we migrate to new class, a lot of stuff can be cleaned up. For instance, Smalltalk tools inspectorTypes holds a dictionary of Class name -> inspector class name so, one could simply register own inspector by including a line: Smalltalk tools inspectorTypes at: #MySpecialClass put: #MySpecialInspector in package/class initialization method, instead of overriding #inspect method. Also, during copying a StandartToolSet convenience methods implementation i discovered a lot of tools which support different protocols. It would be nice to at least make them all respond to same message, like #open. Because currently, if you take a look at different #openXXXXX methods in ToolRegistry, its using many different/weird selectors to do the simplest possible thing - open a new window! In attachments you can find the actual class, and a small changeset which is required to make magic 'Smalltalk tools' working. I decided to put default tools/inspectors types in Preferences class. See Preferences class>>registerPreferredTools method in changeset. -- Best regards, Igor Stasenko AKA sig.