title: Custom background for activatedBackgroundIndicator on ActionBarSherlock doesn't work
body: <p>I'm using <strong>ActionBarSherlock</strong> and I'm trying to customize the <em>activatedBackgroundIndicator</em> attribute for the row background.</p>
  
  <p>If I use the latest android sdk, without the <strong>ActionBarSherlock</strong>, I'm able to customize the background creating the following style on <em>res/values/style.xml</em> and defining it on <em>AndroidManifest.xml</em> as <em>android:theme="@style/Theme.Custom"</em>:  </p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;resources&gt;
    &lt;style name="Theme.Custom" parent="android:Theme.Holo.Light.DarkActionBar"&gt;
       &lt;item name="android:activatedBackgroundIndicator"&gt;@drawable/activated_background&lt;/item&gt;
    &lt;/style&gt;
  &lt;/resources&gt;
  </code></pre>
  
  <p>Then, my <em>res/drawable/activated_background.xml</em> contains the next code: </p>
  
  <pre><code>&lt;selector xmlns:android="http://schemas.android.com/apk/res/android"&gt;  
     &lt;item android:state_activated="true" android:drawable="@color/row_activated" /&gt;
     &lt;item android:drawable="@android:color/transparent" /&gt;  
  &lt;/selector&gt;
  </code></pre>
  
  <p>Finally, the code used to define each row in the ListView is:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:orientation="vertical"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:background="?android:attr/activatedBackgroundIndicator"&gt;
      &lt;TextView
              android:id="@+id/test_row"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:text="@string/sample_string"
              android:textAppearance="?android:attr/textAppearanceMedium"
              android:padding="15dp"/&gt;
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>The result is shown on the screenshoot. Is a simple application with only a ListView with <strong>ListView.CHOICE_MODE_SINGLE</strong> and <strong>getListView().setItemChecked(position, true)</strong> when list item clicked. </p>
  
  <p>The blue color of the standard selected row now is yellow and works perfectly.</p>
  
  <p><img src="https://i.stack.imgur.com/mfwch.png" alt="List without ABS"></p>
  
  <p>The problem appears when I want to apply the same customization using the ActionBarSherlock.
  Now The style file is the next and the background appears blue instead the custom yellow.</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;resources&gt;
      &lt;style name="Theme.Custom" parent="Theme.Sherlock.Light.DarkActionBar"&gt;
          &lt;item name="activatedBackgroundIndicator"&gt;@drawable/activated_background&lt;/item&gt;
          &lt;item name="android:activatedBackgroundIndicator"&gt;@drawable/activated_background&lt;/item&gt;
      &lt;/style&gt;
  
      &lt;style name="activatedBackgroundIndicator"&gt;
          &lt;item name="android:background"&gt;?android:attr/activatedBackgroundIndicator&lt;/item&gt;
      &lt;/style&gt;
  &lt;/resources&gt;
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/Q3P6x.png" alt="List with ABS"></p>
  
  <p>I don't know if <strong>ActionBarSherlock</strong> supports the <em>android:activatedBackgroundIndicator</em> feature or if I forgot to implement something needed to be able to change the default color.</p>
  
  <p>Any ideas?</p>