Hi Piotr,

like you already found out, you can use whenBuiltDo:
But instead of using #hResizing:�� , which is not explicit in specs api
you can call the method hShrinkWrap (look in AbstractMorphicAdapter, protocol 'protocol').

Here is a small example with centering a label:

| ui layout |
������
������ ui := DynamicComposableModel new.
������ ui title: 'hello'.
������ ui instantiateModels: #(
������ ������ label LabelModel
������ ������ check CheckBoxModel
������ ������ text TextInputFieldModel
������ ������ button ButtonModel ).
������ ui label text:'Hello World'.
������ ui label whenBuiltDo:[: widget |widget widget hShrinkWrap.].
������ ������ layout := SpecLayout composed
������ ������ ������ ������ ������ ������ newRow: [ :r | r add: #label] height: 25;
������ ������ ������ ������ yourself.
������ ui openWithSpecLayout: layout.


the block arguemt for whenBuiltDo: is a WidgetBuilt announcement, that gives you access to the model and the widget (-adapter)
that is used.


nicolai