Can't get action view for ActionBar MenuItem using support library

I recently switched from ActionBarSherlock to the Android Support Library ActionBar, and now I get a null on the action view of a spinner in the action bar.

Here's the code as suggested by the docs:

@Override
public boolean onCreateOptionsMenu(Menu menu) { 
  MenuInflater inflater = getMenuInflater();
  inflater.inflate(R.menu.home_menu, menu); 
  MenuItem spinnerItem = menu.findItem(R.id.menuNavigateType);
  View view = MenuItemCompat.getActionView(spinnerItem);// !! view is NULL !!
        ...
}

Here's R.menu.home_menu:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:myapp="http://schemas.android.com/apk/res-auto"> 
  ...
  <item 
    android:id="@+id/menuNavigateType"
    myapp:showAsAction="always"
    myapp:actionViewClass="android.support.v7.widget.Spinner"  />
     ...
</menu>

How do I get my action view?

Thanks.