title: The method getChildFragmentManager() is undefined
body: <p>I have a SherlockFragmentActivity, this Activity have a SectionsPagerAdapter and a ViewPager. When I call the constructor of  the SectionsPagerAdapter with  <code>getChildFragmentManager()</code> method, it shows me this error message:</p>
  
  <blockquote>
    <p>The method getChildFragmentManager() is undefined for the type ViewPagerActivity</p>
  </blockquote>
  
  <p>This is my code:</p>
  
  <pre><code>public class ViewPagerActivity extends SherlockFragmentActivity implements OnPageChangeListener, OnQueryTextListener{
  
  private SectionsPagerAdapter sectionsPagerAdapter;
  private ViewPager viewPager;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.layout_view_pager);
  
      sectionsPagerAdapter = new SectionsPagerAdapter(getChildFragmentManager(), this);
  
      viewPager = (ViewPager) findViewById(R.id.pager);
      viewPager.setAdapter(sectionsPagerAdapter);
      viewPager.setOnPageChangeListener(this);
  
      this.getMovements();
  
      this.getPrizes();
  
      this.getVouchers();
  
      this.createDropdownlist(); 
  }
  </code></pre>
  
  <p>I'm using ActionBarSherlock and I updated the android-support-v4.jar using <em>"Android Tools - Add Support Library"</em> in my project, also on ActionBarSherlock project.</p>
  
  <p>I'm doing this because I need to have a ListFragment inside a Fragment that I use like a page on my ViewPager.</p>