Hi all, I try to play with the GT inspector (thx Andrei and Doru for the great hands on session @ ESUG'14!). In short, I try to add a customized tab for Persons objects using a PersonUI facade and a subclass of GTObjectVariablesBrowser (ok I can explain why if needed ;-)). Like that: Person>>gtInspectorCustomUIIn: composite <gtInspectorPresentationOrder: 5> ^ (composite custom: (MyGTCustomObjectVariablesBrowser new startOn: (PersonUI on: self) )) " <----- HERE" title: 'Customized view'; yourself But, the #variableValuePairsFor: message is not sent to the PersonUI object but to the Person object even if I passed a PersonUI one to the #startOn: method (cf. HERE). startOn: seems to not store properly the object to use afterwards or I missed a something. Did I? please find a code sample attached if needed. Try: Person new inspect Thx for any hint, Cheers, #Luc