Ben Do you have any idea? interpretRegistration: aRegistration | root | root := MenuRegistration owner: self. aRegistration items do: [:item || node | node := item group ifNil: [ root item: item item ] ifNotNil: [:grp | root group: grp ]. item with ifNotNil: [:block || old | old := aRegistration currentRoot. aRegistration currentRoot: node name. [ node with: block ] ensure: [ aRegistration currentRoot: old ]] ifNil: [ item action ifNil: [ node target: item target; arguments: item arguments; selector: item selector ] ifNotNil:[ node action: item action ]]. node keyText: item keyText; help: item help; icon: item icon; order: item order; parent: item parent. item enabled ifNil: [ node enabledBlock: item enabledBlock ] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ I get something that say node does not understand enabledBlock: and I wonder why a MenuRegistration does not understand enableBlock: Stef