ActionBarSherlock Theme with Transparent Background (not working)

gistfile1.xml

 <style name="Theme.TransparentActivity" parent="Theme.Sherlock.Light.ForceOverflow">
        <item name="windowActionBarOverlay">true</item>
        <item name="icon">@drawable/ic_launcher</item>
        <item name="android:background">@android:color/transparent</item>
        <item name="background">@android:color/transparent</item>
        <item name="android:windowIsTranslucent">true</item>
        <item name="android:windowContentOverlay">@null</item>
        <item name="android:windowIsFloating">true</item>
        <item name="android:backgroundDimEnabled">false</item>
</style>