title: How to give background color to Group in Constraintlayout
body: <p>I have grouped 3 textview in a constraint layout. I have background to the group, but its not working.</p>
  
  <pre><code>&lt;android.support.constraint.Group
                      android:id="@+id/group"
                      android:layout_width="wrap_content"
                      android:layout_height="wrap_content"
                      android:background="@color/text_color_3"
                      app:constraint_referenced_ids="price_tv,currency_unit_tv,frequency_tv" /&gt;
  </code></pre>
  
  <p>Is there anyway other round to do it.</p>