Hello Felix,
FD> What I currently need is something that displays a List of Strings with FD> a Top2Bottom Layout, similar to a Swing JList.
PluggableListMorph is your friend.
Make sure to get the pluggableMorphsDemo...pr from http://wiki.squeak.org/squeak/2962
It helps to get you up to speed.
This at least works up to 3.8 but I guess also in current images.