Hi, I've implemented a small UI using the dynamic features of spec and I'd like to know if there isn't a better way to do it. My use case is simple: I have a normal ComposableModel that has two models - a list and a DynamicComposableModel. The DynamicComposableModel should contain a list of buttons that should change every time the user selects an element in the list. I've implemented a demo that can be seen if you download the package DynamicSpec-Examples from http://www.smalltalkhub.com/mc/AndreiChis/Playground/main and execute the code from the class comment of DSChangingButtons. My problem is that the widget containing the buttons has to define a spec layout on the class side. I haven't found a way to tell the spec layout to add a widget and use a method on the object for constructing the layout. I've manage to get away by dynamically reconstructing the layout when the selection changes, however it's not that nice because I had to duplicate the layout of the main widget both on the class side and the object side. It would be nice to add a widget to the layout like this: 'aSpec dynamicAdd: modelGetter withSpec: aSymbol ' that would call aSymbol on the object and not on the class. This may or may not make sense :) To be concrete, the method DSToolbarModel>>updateButtons will call the method dynamicLayout on it's parent which in turn will call dynamicLayoutWithSpec: on the toolbar. I'd like to avoid this, and when specifying the layout of the parent widget to call a method on the instance side of it subwidgets to get their layout. Now I'll end here this rather long email :) Cheers, Andrei