title: Android data binding, Radio Button not updating
body: <p>I have some RadioButtons and I want them to be checked/unchecked as the model changes, using Data Binding.<br>
  I managed to set up an EditText and it is working fine.<br>
  Anyway, the RadioButtons behave as the android:checked property wouldn't be there.</p>
  
  <pre><code>&lt;RadioButton 
      android:id="@+id/radio_kitchen"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="@string/kitchen"
      android:checked="@{radiator.room==@string/kitchen?true:false}"
  /&gt;
  </code></pre>