title: How to not affect current route and change 'Title' of NavigationBarRouteMapper directly -- React Native?
body: <p>Following is snippet:</p>
  
  <pre><code>var NavigationBarRouteMapper = {
      ...
     ,
      RightButton(route, navigator, index, navState){
        return(
          &lt;TouchableHighlight onPress={()=&gt;{
              //Once clicked, I would like it to rerender the NavigationBarRouteMapper's Title directly without having to change the current route
            }
          }&gt;
            &lt;Text&gt;Button&lt;/Text&gt;
          &lt;/TouchableHighlight&gt;
        )
      },
      Title(route, navigator, index, navState){
          //e.g. if(route.name == 'ButtonPressed'){return &lt;Text&gt;New Title&lt;/Text&gt;} else return null
  </code></pre>
  
  <p>Once the RightButton is clicked, I would want it to render the Title to </p>
  
  <pre><code>&lt;Text&gt;New Title&lt;/Text&gt; 
  </code></pre>
  
  <p>if not just return null. Is there a way to do so without having to change the current route? </p>