I'm having to use `TabHost` in place of `ActionBarTabs` and to make them scroll-able I've wrapped my `TabWidget` in a `HorizontalScrollView`, but the `HorizontalScrollView` doesn't scroll itself in accordance with `ViewPager`. I've tried using scrollTo and fullScroll in a couple of different ways, but it doesn't change anything. What do I need to do to get this working correctly? 

```
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <HorizontalScrollView
        android:id="@id/horizontalScrollView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:fillViewport="true"
        android:scrollbars="@null" >

        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal" />
    </HorizontalScrollView>

    <FrameLayout
        android:id="@android:id/tabcontent"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_weight="0" />

    <android.support.v4.view.ViewPager
        android:id="@id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

</LinearLayout>

```

```
        @Override
    public void onTabChanged(String tabId) {
        int position = mTabHost.getCurrentTab();
        mViewPager.setCurrentItem(position);
        mHorizontalScrollView.scrollTo(position, 0);
    }

    @Override
    public void onPageScrolled(int position, float positionOffset,
            int positionOffsetPixels) {
        mHorizontalScrollView.scrollTo(position, 0);
    }

```