title: cannot resolved method getChildFragmentManager()
body: <p>error: The 'childFragmentManager' parameter only can be used if the getChildFragmentManager() method is available in android.support.v4.app.Fragment, update your support library version.</p>
  
  <p>i have  compile 'com.android.support:support-v4:24.2.0' in my gradle. My code like;</p>
  
  <pre><code> import android.support.v4.app.Fragment;
   import org.androidannotations.annotations.*;
   import org.androidannotations.annotations.sharedpreferences.Pref;
  .
  .
  
  @EFragment(R.layout.fragment_main)
  public class MainFragment extends Fragment {
  @Pref
  ApplicationSettings_ applicationSettings;
  @ViewById(R.id.bot)
  public LinearLayout bot;
  @ViewById(R.id.center)
  public LinearLayout center;
  @Bean
  UIItemGenerator uiItemGenerator;
  @SystemService
  LayoutInflater layoutInflater;
  @FragmentById(value = R.id.contentFragment,childFragment = true)
  public ContentFragment contentFragment;
  
  public MainFragment() {
  }
  
  @Click(R.id.imagebutton_ribbon)
  public void ribbonClick(View view) {
      view.setVisibility(View.GONE);
  }
  
  .
  .
  .
  @AfterViews
  public void afterViews() {
      if (contentFragment == null)
          contentFragment = (ContentFragment) this.getChildFragmentManager().findFragmentById(R.id.contentFragment);
      for (int j = 0; j &lt; bot.getChildCount(); j++) {
          bot.getChildAt(j).setSelected(false);
      }
      for (int j = 0; j &lt; top.getChildCount(); j++) {
          top.getChildAt(j).setSelected(false);
      }
      ll_home.setSelected(true);
      ll_allrooms.setSelected(true);
      initUI();
      contentFragment.generateContent(-1, -1);
      imagebutton_top_rightarrow.setSelected(true);
      imagebutton_bot_rightarrow.setSelected(true);
  </code></pre>