Hi. If you have any knowledge on how Spec adapters work, maybe you can take a look. To reproduce the bug:
execute: "TabsExample open" and select one of (non-active) the tabs. Case here: https://pharo.fogbugz.com/f/cases/14030/MorphicTabManagerAdapter-doesNotUnderstand-tabSelected <https://pharo.fogbugz.com/f/cases/14030/MorphicTabManagerAdapter-doesNotUnderstand-tabSelected> Uko
