wow - that was quite fast ! I was looking for one single property to fulfill all my wishes with one option...
But since my wishes change more than daily I guess it's better that there isn't such an option.
As a reminder for me, when I search for this again ;-)
I added it to OnEditingDone for the current Row and also I call it for all Rows after Data has been loaded into the Grid.
Grid.MultiLine and goRowSizing must be set to True.