Couldn't Change Actionbarsherlock Searchview Icon

When I use following configuration:

    <style name="MyTheme" parent="Theme.Sherlock">
            <item name="searchViewCloseIcon">@drawable/YOUR_CLOSE_ICON</item>
            <item name="searchViewSearchIcon">@drawable/YOUR_SEARCH_ICON</item>
            <item name="searchAutoCompleteTextView">@style/searchTextView</item>
    </style>

    <style name="searchTextView" parent="Widget.Sherlock.SearchAutoCompleteTextView">
            <item name="android:textColor">@android:color/white</item>
            <item name="android:textColorHint">@android:color/black</item>
    </style>