Hi, I want to build a morphic application (for algorithm animation) so I need to do something in the step method. I wanted to make it a subclass of SystemWindow (I'd actually prefer StandardWindow in Pharo but there doesn't appear to be an equivalent in Squeak). But when I do, the step method doesn't get called. (Nor does stepAt:) (And StandardWindow behaves the same.). But if I move it to MorphicModel step/stepAt: gets called, but I don't get any of that SystemWindow goodness. I've looked at the dispatch in Morph, and I don't see anything different in Worldstate>>runLocalStepMethodIn: but this stuff is very difficult to debug, because there's asynchronous stuff running behind the scenes. In particular, lastStepMessage value: now. lastStepMessage ifNotNil: [... is a little weird! Any pointers appreciated. Thanks ../Dave