while becoming familiar with my project again I discovered something I would say: Is a Bug.
Setting Style attributes during creation of lemur elements only apply to the defaultstandard style.
Some minor changes in Styling are necessary to make it work. I tried and checked it in TextField, Listbox and an individual (my own) created lemur element.
And as you may ask (bonus etc…) I already made a PR and yes again I have documented and explained it there.
Hope its realy a bug and if yes the fix fixes it.