title: ActionBarCompat and windowContentOverlay
body: <p>I've recently updated my project migrating from ActionBarSherlock to the new Google's ActionBarCompat. I've found a really tedious issue.</p>
  
  <p>If you create a brand new project with ActionBarCompat (use Theme.AppCompat.Light) you'll notice that the shadow under the Action Bar is also present at the top of the window.
  As I can see the default theme of Theme.AppCompat define the property windowContentOverlay as follows:</p>
  
  <pre><code>&lt;item name="android:windowContentOverlay"&gt;@drawable/actionbarcompat_shadow&lt;/item&gt;
  </code></pre>
  
  <p>I worked on it for hours but I could not resolve the problem, the shadow is duplicated on top of the ActionBar. Did anybody found the same issue?</p>