Thanks for the immediate feedback!
I realized from your snippet what was missing in my attempt:
| form window | form := anAddress asMorph addButtons. window := SystemWindow new addMorph: form ***morph*** fullFrame: (LayoutFrame fractions: (0@0 corner: 1.0@1.0) offsets: (10@10 corner: 10@10)). window openInWorld.
OMG! It seems terribly misleading to me to call something a morph that is not a morph. This violates the principle of least surprise, and while surprises are nice today because it's a holiday, not so much the rest of the year ;-)
Humble suggestions: 1) change #asMorph to something like forMorphic 2) make #addWindow behave more reasonably 3) MAContainerMorph and friends -> MAMorphicContainer
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