title: ActionBarSherlock: changing homeAsUpIndicator doesn't work
body: <p>I'm want to change the up icon with applying the following style to my activity, but it doesn't work and but I still get the default black '&lt;' icon. </p>
  
  <p>Can anyone find out what is missing here?</p>
  
  <pre><code>&lt;style name="AppTheme.ActionBar" parent="@style/Theme.Sherlock.Light"&gt;
      &lt;item name="actionBarStyle"&gt;@style/actionBarStyle&lt;/item&gt;
      &lt;item name="android:actionBarStyle"&gt;@style/actionBarStyle&lt;/item&gt;
  &lt;/style&gt;
  
  &lt;style name="actionBarStyle" parent="@style/Widget.Sherlock.Light.ActionBar.Solid"&gt;
      &lt;item name="android:background"&gt;@drawable/header_bar&lt;/item&gt;
      &lt;item name="background"&gt;@drawable/header_bar&lt;/item&gt;
  
      &lt;item name="android:homeAsUpIndicator"&gt;@drawable/up_indicator&lt;/item&gt;
      &lt;item name="homeAsUpIndicator"&gt;@drawable/up_indicator&lt;/item&gt;
      &lt;item name="android:displayOptions"&gt;homeAsUp|showHome&lt;/item&gt;
      &lt;item name="displayOptions"&gt;homeAsUp|showHome&lt;/item&gt;
  
  &lt;/style&gt;
  </code></pre>