title: Databinding returning null. Is it normal?
body: <p>I'm using databinding, and looks like tab item is returned null from databinding (but not gameTypes), is that normal? Other views are working fine, so there is no problem with implementation of databinding. Here is part of layout file.</p>
  
  <pre><code>            &lt;android.support.design.widget.TabLayout
              android:id="@+id/gameTypes"
              android:layout_width="0dp"
              android:layout_height="48dp"
              android:background="@android:color/white"
              &gt;
  
              &lt;android.support.design.widget.TabItem
                  android:id="@+id/football"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:tag="football"
                  android:text="Football"
              /&gt;
  
              &lt;android.support.design.widget.TabItem
                  android:id="@+id/basketball"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:tag="basketball"
                  android:text="Basketball"/&gt;
  
  
          &lt;/android.support.design.widget.TabLayout&gt;
  </code></pre>
  
  <p>Here is code that I'm trying to find selected tab;</p>
  
  <pre><code>    private Boolean isSelectedTab(TabItem item, TabLayout.Tab tab) {
      if (tab.getTag().equals(item.getTag()))
          return true;
      return false;
      }
  </code></pre>
  
  <p>Error is; item is null which is <code>databinding.basketball</code>. I think shouldn't be null since it's <code>TabItem</code>.</p>
  
  <p>Thanks.</p>