[Newbies] Generating subMorphs with relative coordinates

Dear List,

I would like to generate Morphs inside another parent Morph. In this case a bunch of CircleMorphs inside a RectangleMorph.

ATM I am generating them first and then adding them as a whole with a OrderedCollection and addAllMorphs:

Now during creating of the circles I am adding the world offset of the Rectangle morph to their bounds:

Is there a way to use relative coordinates for everything and have the system place the Morphs accordingly?

So far I have found addMorphFrontFromWorldPosition: but that seems a bit awkward to use in this case.

How do you deal with this situation usually?

Thanks and kind regards,

Christian