ActionBar background only works in portrait mode
<p>I have this</p>

<pre><code>@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        actionBar = getActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);



        mSectionsPagerAdapter = new SectionsPagerAdapter(this,
                getSupportFragmentManager());
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        actionBar.setDisplayShowTitleEnabled(false);
        actionBar.setDisplayShowHomeEnabled(false);

        actionBar.setStackedBackgroundDrawable(getResources().getDrawable(
                R.drawable.navbar_bg));
</code></pre>

<p>Why does the last line only work in portrait mode, in landscape mode no background is applied. I have not applied any custom orientation styles to the activity. Thank you</p>
