[Cuis] How to center a submorph in its owner morph?

[H. Hirzel]

Hello

I want to add an instance of ImageMorph to an instance of  Morph and
center it there?

How do I do that?

I have done experiments with newRow and newColumn layout, see
  https://github.com/hhzl/Cuis-Add-Ons

But I do not have examples yet of centering.

Thank you for the answer in advance.

Hannes