title: TabWidget will not display, even though it displays in ADT editor
body: <p>My TabWidget will not display, even though it shows up in the Eclipse graphical editor. I can't find any reason why. Why isn't my tab bar showing?</p>
  
  <p>Eclipse</p>
  
  <p><img src="https://i.imgur.com/ECS8XSr.png?1" alt="Imgur"></p>
  
  <p>Emulator</p>
  
  <p><img src="https://i.imgur.com/Y2w4RGe.png" alt="Imgur"></p>
  
  <p>XML source of the activity: <a href="http://pastebin.com/Au9XFXPa" rel="nofollow noreferrer">http://pastebin.com/Au9XFXPa</a></p>
  
  <p>Extract from activity:</p>
  
  <pre><code>        &lt;TabWidget
              android:id="@android:id/tabs"
              android:layout_width="match_parent"
              android:layout_height="wrap_content" &gt;
          &lt;/TabWidget&gt;
  </code></pre>
  
  <p>Results from Android lint:</p>
  
  <pre><code>$ lint.bat res/layout/activity_calculator.xml
  Scanning Catalyst: .
  No issues found.
  </code></pre>