Divider between Action bar icons

I added two icons to my action bar. When I add text, a divider will show up between the two texts, but no divider is shown between icons. I tried a custom style, but it isn't working:

<style name="AppTheme" parent="android:Theme.Holo.Light">

    <item name="android:actionBarStyle">@style/ActionBar</item>

</style>


<style name="ActionBar" parent="android:style/Widget.Holo.Light.ActionBar">

    <item name="android:showDividers">middle</item>
    <item name="android:actionBarDivider">#BBBBBB</item>

</style>

I'm only getting this (no divider):

But I want something like this: