title: How to invoke the ActionBar's ContextMenu-like behavior?
body: <p>In Android 3.0, when you select some text for example, the ActionBar switches to a ContextMenu-like mode, which enables you to do actions with the selected text: copy/share/etc, and a "Done" button appears on the left side to enable the user to leave this mode.</p>
  
  <p>How can I switch the ActionBar into this mode in my app (with my menu items of course)? I just couldn't find this in the docs.</p>