Thanks for the input.
I have a solution where the users are selection from a portal with up and down arrows. In the portal I have grouped some fields, and with conditional formatting you can see which row you are selecting.
But the grey background irritated my eye.
Today I found this workaround.
Made a small button, and named it. Then put it behind the grouped fields.
In my script where I used go to next (previous) portal row - I added a go to object ( the small button )
This takes away the focus on the row and removes the grey background, and I only see my conditional formattet fields in the row.