title: anchor popup menu over overflow button
body: <p>I'm trying to create a custom popup menu that I would like to position on  the overflow menu button of the actionbar (am using a <code>Toolbar</code> with <code>setSupportActionBar()</code> for this if it matters). I found out that this can be done with the <code>setAnchorView()</code> (from reading <a href="https://stackoverflow.com/questions/28030579/custom-menu-item-in-overflow-menu">Custom Menu item in Overflow menu</a>). </p>
  
  <p>However I cant seem to figure out how to retrieve the overflow menu as a view (that I could use to set the anchor with).</p>
  
  <p>Also I did try anchoring this to the parent layout of the activity itself but it showed up on the left top, and the height of the menu was equal to the height of the actionbar (which is not very useful).</p>
  
  <p>Does anyone know how this can be achieved?</p>