title: Menu options not showing on Collapsing Toolbar
body: <p>I am trying to implement a Collapsing Toolbar Layout with menu options but whenever I set the image view source in the below code, the image covers the menu and the back button.  The options are there as I can click on them, they are just hidden by the image.  Does anyone know how to fix this? </p>
  
  <p>XML Layout
      </p>
  
  <pre><code>    &lt;android.support.design.widget.AppBarLayout android:id="@+id/app_bar"
          android:layout_width="match_parent" android:layout_height="@dimen/app_bar_height"
          android:fitsSystemWindows="true"
          android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"&gt;
  
          &lt;android.support.design.widget.CollapsingToolbarLayout android:id="@+id/toolbar_layout"
              android:layout_width="match_parent" android:layout_height="match_parent"
              android:fitsSystemWindows="true" app:contentScrim="?attr/colorPrimary"
              app:layout_scrollFlags="scroll|exitUntilCollapsed" app:toolbarId="@+id/toolbar"&gt;
  
              &lt;android.support.v7.widget.Toolbar android:id="@+id/detail_toolbar"
                  android:layout_width="match_parent" android:layout_height="?attr/actionBarSize"
                  app:layout_collapseMode="pin"
                  app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
                  android:fitsSystemWindows="true"/&gt;
  
              &lt;ImageView
                  android:src="@drawable/background"
                  app:layout_scrollFlags="scroll|enterAlways|enterAlwaysCollapsed"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:scaleType="centerCrop"
                  app:layout_collapseMode="parallax"
                  android:minHeight="100dp"
                  android:fitsSystemWindows="true"/&gt;
  
          &lt;/android.support.design.widget.CollapsingToolbarLayout&gt;
  
  &lt;/android.support.design.widget.AppBarLayout&gt;
  </code></pre>