title: Inner PreferenceScreen does not open with PreferenceFragmentCompat
body: <p>My inner PreferenceScreen of PreferenceFragmentCompat is not showing, or seems to ignore tapping events.</p>
  
  <p>I created <code>MyPreferenceFragment</code> that <code>extends PreferenceFragmentCompat</code> </p>
  
  <pre><code>public class MyPreferenceFragment extends PreferenceFragmentCompat {
   @Override
    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
      addPreferencesFromResource(R.xml.preferences);
    }
  }
  </code></pre>
  
  <p>then I changed my theme at <code>styles.xml</code> like</p>
  
  <pre><code>&lt;style name="AppTheme" parent="@style/Theme.AppCompat.Light"&gt;
    &lt;item name="preferenceTheme"&gt;@style/PreferenceThemeOverlay&lt;/item&gt;
  &lt;/style&gt;
  </code></pre>
  
  <p>And finally create my <code>preferences.xml</code> file like</p>
  
  <pre><code>&lt;PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"&gt;
      &lt;CheckBoxPreference android:title="Check Me"/&gt;
      &lt;PreferenceScreen android:title="My Screen"&gt; &lt;!-- This is not opening --&gt;
          &lt;EditTextPreference android:title="Edit text" /&gt;
      &lt;/PreferenceScreen&gt;
  &lt;/PreferenceScreen&gt;
  </code></pre>
  
  <p>At the <code>build.gradle</code> I have added both:</p>
  
  <pre><code>compile 'com.android.support:appcompat-v7:23.0.1'
  compile 'com.android.support:preference-v7:23.0.1'
  </code></pre>
  
  <p>code of the Activity</p>
  
  <pre><code>public class MainActivity extends AppCompatActivity {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
      }
  }
  </code></pre>
  
  <p>activity_main.xml</p>
  
  <pre><code>&lt;fragment xmlns:android="http://schemas.android.com/apk/res/android"
      android:id="@+id/fragment"
      android:name="com.mando.preferenceapp.MyPreferenceFragment"
      android:layout_width="match_parent"
      android:layout_height="match_parent" /&gt;
  </code></pre>
  
  <p>Testing the above code I cannot open / get into the preference screen. Am I missing something? Why this isn't working?</p>