android - How to turn off blue line under ActionBar (ActionBarSherlock)?

Question

I use ActionBarSherlock with theme Theme.Sherlock.ForceOverflow (for using on pre Honeycomb devices) and I need turn off blue line under my ActionBar....is it possible?

SOLUTION: here

Answer 1

Another way to solve the problem:

actionBar.setBackgroundDrawable(null);

Only solves the problem locally though.