Styling Android tabs with xml

I'm trying to style the default Android tabs so that they appear at the bottom and that they have a different background color. I've already managed to place them at the bottom. But the background color isn't changing.

This is what i have so far. One xml file called titanium_tabgroup.xml:

<?xml version="1.0" encoding="utf-8"?> 
<TabHost xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@android:id/tabhost" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"> 
    <LinearLayout 
        android:orientation="vertical" 
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent" 
        android:padding="0dp" 
        android:background="@drawable/tab_selector" > 
 
        <FrameLayout 
            android:id="@android:id/tabcontent" 
            android:layout_width="fill_parent" 
            android:layout_height="fill_parent" 
            android:padding="0dp" 
            android:layout_weight="1" /> 
 
        <TabWidget 
            android:id="@android:id/tabs" 
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content" 
            android:layout_weight="0" /> 
    </LinearLayout> 
</TabHost>

Notice that in there i'm specifying a background in the LinearLayout tag.

In the xml file tab_selector.xml i have:

<selector xmlns:android="http://schemas.android.com/apk/res/android"> 
 
    <item android:state_pressed="true"> 
        <shape>  
            <gradient  
                android:endColor="#ffffff"  
                android:startColor="#AAAAAA"  
                android:angle="270" />  
            <stroke  
                android:width="1px"  
                android:color="#000000" />  
        </shape> 
    </item> 
 
    <item 
        android:state_selected="false"  
        android:state_focused="false"  
        android:state_pressed="false"> 
        <shape>  
            <gradient  
                android:endColor="#ffffff"  
                android:startColor="#AAAAAA"  
                android:angle="270" />  
            <stroke  
                android:width="1px"  
                android:color="#000000" />  
        </shape> 
    </item> 
 
    <!-- and the other states. They are the same as the ones above --> 
    ... 
    ... 
    ... 
 
</selector>

But this doesn't change the background color of the tabs. It still shows me the old original Android tabs.

Any idea how i can make this work? Perhaps with a slightly different method?