title: View pager with expandable listview not working properly in collapsing toolbar
body: <p>I am implementing collapsing tool bar with tab layout, and i used expandable list view inside view pager. code works perfect but when i scroll upside it will not showing all the data in expandable list view but it only shows whatever loaded on first time <a href="http://i.stack.imgur.com/HiGmv.png" rel="nofollow">enter image description here</a></p>
  
  <p><a href="http://i.stack.imgur.com/DSRDj.png" rel="nofollow">enter image description here</a></p>
  
  <p>here is my collapsing toolbar code</p>
  
  <pre><code>&lt;android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/drawerlayout"
  android:layout_width="match_parent"
  android:layout_height="match_parent"&gt;
  
  &lt;android.support.design.widget.CoordinatorLayout
      android:id="@+id/root_coordinator"
      android:layout_width="match_parent"
      android:layout_height="match_parent"&gt;
  
      &lt;android.support.design.widget.AppBarLayout
          android:id="@+id/app_bar_layout"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"&gt;
  
          &lt;android.support.design.widget.CollapsingToolbarLayout
              android:id="@+id/collapsing_toolbar_layout"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              app:contentScrim="?attr/colorPrimary"
              app:layout_scrollFlags="scroll|enterAlways"&gt;
  
              &lt;ImageView
                  android:id="@+id/collapseImage"
                  android:layout_width="match_parent"
                  android:layout_height="192dp"
                  android:scaleType="centerCrop"
                  app:layout_collapseMode="parallax" /&gt;
  
              &lt;android.support.v7.widget.Toolbar
                  android:id="@+id/app_bar"
                  android:layout_width="match_parent"
                  android:layout_height="?attr/actionBarSize"
                  android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
                  app:layout_collapseMode="pin" /&gt;
  
          &lt;/android.support.design.widget.CollapsingToolbarLayout&gt;
  
          &lt;android.support.design.widget.CollapsingToolbarLayout
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              app:layout_scrollFlags="scroll|enterAlways"&gt;
  
              &lt;android.support.design.widget.TabLayout
                  android:id="@+id/tab_layout"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:background="#999"
                  app:layout_collapseMode="pin"
                  app:tabIndicatorColor="@color/primaryColorDark"
                  app:tabMode="scrollable"
                  app:tabSelectedTextColor="@android:color/white"
                  app:tabTextColor="#EEE" /&gt;
  
  
          &lt;/android.support.design.widget.CollapsingToolbarLayout&gt;
  
          &lt;android.support.v4.view.ViewPager
              android:id="@+id/view_pager"
              android:layout_width="match_parent"
              android:layout_height="fill_parent"
              android:background="#FFFFFF"
              app:layout_behavior="@string/appbar_scrolling_view_behavior" /&gt;
  
  
      &lt;/android.support.design.widget.AppBarLayout&gt;
  
  
  &lt;/android.support.design.widget.CoordinatorLayout&gt;
  
  &lt;fragment
      android:id="@+id/fragment_navigation_drawer"
      android:name="asndeal.com.asndeal.NavigationDrawerFragment"
      android:layout_width="280dp"
      android:layout_height="match_parent"
      android:layout_gravity="start"
      app:layout="@layout/fragment_navigation_drawer"
      tools:layout="@layout/fragment_navigation_drawer" /&gt;
  </code></pre>
  
  <p></p>
  
  <p>and </p>
  
  <pre><code>&lt;FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context="asndeal.com.asndeal.CatName"&gt;
  
  &lt;!-- TODO: Update blank fragment layout --&gt;
  
  &lt;ExpandableListView
      android:id="@+id/expandableListView"
      android:layout_width="match_parent"
      android:layout_height="match_parent" /&gt;
  </code></pre>
  
  <p></p>
  
  <p>thanks in advance..</p>