Hi we have ValueHolder and NewValueHolder so I wanted to remove the 6 last user of ValueHolder. Now I see that we have ValueHolder >> contents: newContents contents := newContents. self changed: #contents NewValueHolder >> value: anObject self handleCircularReferencesWhile: [ | oldValue | oldValue := value. value := anObject. self valueChanged: oldValue ]. ^ value So dialog newSliderFor: (ValueHolder new contents: 0.5) getValue: #contents setValue: #contents: help: 'This is a slider'). => (dialog newSliderFor: (NewValueHolder new value: 0.5; yourself) getValue: #value setValue: #value: help: 'This is a slider'). and I find that boring to have to be forced to use yourself. as an experiment I changed the definition of value: to NewValueHolder >> value: anObject self handleCircularReferencesWhile: [ | oldValue | oldValue := value. value := anObject. self valueChanged: oldValue ]. Now I'm looking for spec users to tell me if I break something. Stef