title: How to change the overflow button when in CAB?
body: <p>I have 2 different backgrounds to the Action bar. One light and another dark. One for the default title and another for the CAB (when some of the elements are selected/activated).</p>
  
  <p>I would like to have 2 different overflow when in those different states.
  I tried the selector but couldn't find the state to represent when in CAB mode.</p>
  
  <p><strong>Any idea how to provide different overflow buttons?</strong></p>
  
  <ul>
  <li>On a more general note, where can I start exploring the Action Bar so I could find the answers myself instead of finding bits and pieces all over the inet? I would expect Google/Android to provide a starting point. I guess I just didn't find it.</li>
  </ul>