title: Remove shadow below actionbar
body: <p>I use actionbarsherlock. The piece of code below is responsible for changing it's background to a custom one.</p>
  
  <pre><code>&lt;style name="Widget.Styled.ActionBar" parent="Widget.Sherlock.ActionBar"&gt;
      &lt;item name="background"&gt;@drawable/actionbar_bg&lt;/item&gt;
      &lt;item name="android:background"&gt;@drawable/actionbar_bg&lt;/item&gt;
      &lt;...&gt;  
  &lt;/style&gt;
  
  &lt;style name="Theme.MyApp" parent="@style/Theme.Sherlock.Light"&gt;
      &lt;item name="actionBarStyle"&gt;@style/Widget.Styled.ActionBar&lt;/item&gt;
      &lt;item name="android:actionBarStyle"&gt;@style/Widget.Styled.ActionBar&lt;/item&gt;
      &lt;..&gt;
  &lt;/style&gt;
  </code></pre>
  
  <p>And it works for actionbarsherlock (on versions below honeycomb). But in ICS I have a shadow below actionbar which I don't want. <strong>What is the style item to make it disappear?</strong></p>