Hi ! First, I apologyse for the wall of text. I'm trying my hands at Spec and I have few questions: - How can I implement an instance-dependent layout ? Regarding the layout method lookup, the documentation states that it "starts on instance side, which allows a UI to have a more specific layout depending on the state of the instance" I tried to simply put a layout in an instance method with the *<spec: #default>* pragma. But not only was it not retrieved by *ComposableModel>#defaultSpecSelector* but *ComposableModel>#retrieveSpec:*will send the selector on the class anyway. What I ended up doing was overiding #openWithSpec (which worked) but I'm pretty sure that my model is not composable at all. - Is it possible to change the "skin" of the basic widget ? I would like to implement some sort of toggle button by changing the color of ButtonModel and so far, I failed. I was not able to trace my color change up to the PluggableButtonMorph because it seems to use anoucement and I'm a Smalltalk rookie. I tried however to send #color: directly to the morph which does nothing: the #changed method rolls it back to its previous value. So I may be doing something wrong but it doesn't feel like the issue comes from Spec. Any clue ? - On a side note, I tried to send an argument to the selector that retrieve a widget in the layout method. And I came up with this : layout *add:* {#buttonAt: . 1}; *add:* {#buttonAt: . 2}; *add:* {#buttonAt: . 3} Is it how it's done ? Thanks in advance ! Thomas.