You should load the default group of the ConfigurationOfGTInspector. This will load Roassal2, the binding with Glamour and the inspector extensions that use Roassal2.
What should I do to be able to use roassal2 representation on Pharo? Because I���ve tried to load Roassal2 group form ConfigurationOfGlamour, but then it loads newer version of glamour which breaks in some way the inspector.