title: How can I change the top border of my UITabBar?
body: <p>I'd like the UITabBar to have a top border of width 5.0. The border should be yellow color.
  I don't want any left/bottom/right borders.</p>
  
  <p>The Tab Bar border should be flat (no shadows or anything like that).</p>
  
  <p>How can I remove shadow (image) line?</p>