title: Unresolved class '@string/appbar_scrolling_view_behavior'
body: <p>After i updated Android Studio i get this error in my xml for my viewpager.
   Weird thing is it works fine and the project builds without any problems.</p>
  
  <p>What is the reason that <strong>'@string/appbar_scrolling_view_behavior'</strong> is an 
   <strong>Unresolved class</strong>?</p>
  
  <pre><code> &lt;android.support.v4.view.ViewPager
       android:id="@+id/viewPager"
       android:layout_width="match_parent"
       android:layout_height="match_parent"           
       app:layout_behavior="@string/appbar_scrolling_view_behavior"&gt;
   &lt;/android.support.v4.view.ViewPager&gt;
  </code></pre>
  
  <p>My viewpager is inside a <strong>CoordinatorLayout</strong>.</p>