title: FragmentTabHost graphical layout doesn't render
body: <p>The graphical layout for a simple android.support.v4.app.FragmentTabHost never renders in either Eclipse or Android Studio.<br>
  The Console error I get is consistently:<br>
  <code>Exception raised during rendering: No tab known for tag null</code></p>
  
  <p>I'm using the most basic XML file:</p>
  
  <pre><code>&lt;android.support.v4.app.FragmentTabHost
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:id="@android:id/tabhost"
      android:layout_width="match_parent"
      android:layout_height="match_parent"&gt;
  
      &lt;LinearLayout
          android:orientation="vertical"
          android:layout_width="match_parent"
          android:layout_height="match_parent"&gt;
  
          &lt;TabWidget
              android:id="@android:id/tabs"
              android:orientation="horizontal"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:layout_weight="0"/&gt;
  
          &lt;FrameLayout
              android:id="@android:id/tabcontent"
              android:layout_width="0dp"
              android:layout_height="0dp"
              android:layout_weight="0"/&gt;
  
          &lt;FrameLayout
              android:id="@+id/realtabcontent"
              android:layout_width="match_parent"
              android:layout_height="0dp"
              android:layout_weight="1"/&gt;
  
      &lt;/LinearLayout&gt;
  &lt;/android.support.v4.app.FragmentTabHost&gt;
  </code></pre>
  
  <p>but the same error occurs.  </p>
  
  <p>I just wanted to add more views above or below the tab widget and frame layout.<br>
  I don't care so much about seeing the tab content; I just want to see <em>the rest of my layout</em> - <strong>but the problem is that NO OTHER VIEWS are rendered when a</strong> <code>android.support.v4.app.FragmentTabHost</code> <strong>resides in the layout</strong>.  </p>
  
  <p>I've read and tried to resolve the issue from the answer to this post:<br>
  <a href="https://stackoverflow.com/questions/13408709/android-tabs-at-the-bottom-with-fragmenttabhost">Android: Tabs at the bottom with FragmentTabHost</a><br>
  but I don't think that that is my problem; I'm not looking to put a TabWidget on the bottom.</p>
  
  <p>Every other one of my XML files opens perfectly.  </p>
  
  <p>The same problem occurs in Android Studio:<br>
  <img src="https://i.stack.imgur.com/uGe6T.png" alt="Android Studio doesn&#39;t render this either"></p>