Nimbus Look And Feel adjust colors of menubar

Question

I am trying to adjust the colors of the Nimbus Look and Feel but it is only working partially. Especially I have problems adjusting the colors of the menubar.

Here i

Answer 1

for JMenuBar to have to use Painter, to check NimbusDefault#value

MenuBar[Enabled].backgroundPainter
MenuBar[Enabled].borderPainter

rest is in answer by trashgod +1