k-9/res/values/themes.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <style name="Theme.K9.Light" parent="Theme.Sherlock.Light">
        <item name="android:autoCompleteTextViewStyle">@style/Widget.K9.AutoCompleteTextView</item>
    </style>

    <style name="Theme.K9.Dark" parent="Theme.Sherlock">
        <item name="android:autoCompleteTextViewStyle">@style/Widget.K9.AutoCompleteTextView</item>
    </style>

</resources>