@ferdinand thank you for your welcoming words, for your help and edits.
Since I am no trained developer I was simply copy and pasting my first lines of code including the RegisterCommand function from the maxon python example github and thought it would fit my application since I thought the description in the sdk seemedlike a match to me ["Command can be dragged into an icon bar and delivers its own dialogs instead of icons." (- maybe I got that wrong)]. Also scince I have little developing experience the term "smallnode" is nothing I can make sense of and an accurate description seems to be missing.
Nevertheless I tried your suggestion and it works like a charm.
Thanks a lot 🙌
Marc