title: ActionBar Menu Items disappear in NestedFragments
body: <p>Since android 4.2 now support <a href="http://developer.android.com/about/versions/android-4.2.html#NestedFragments">NestedFragment</a> , and added it to support v13.</p>
  
  <p>I use this NestedFragment on a classic situation : Create fragmentA that can swipe left and right and consume a majority of the screen space, and insert fragmentB and fragmentC into each fragment page.</p>
  
  <p>My Problem is the MenuItem I create in fragmentB and fragmentC can`t show on Activity`s actionbar.Which before I use NestedFragment , it works well.</p>