title: how to show navigation bar using navigator component in react-native
body: <p>Hi every one I am trying to use <code>navigator</code> component in place of <code>navigatorIOS</code>, but what the problem <code>navigator</code> is not showing in view, below is my code for <code>navigator</code> and <code>navigatorIOS</code></p>
  
  <p><strong>NavigatorIOS:</strong></p>
  
  <pre><code>&lt;NavigatorIOS
       style={styles.navigator}
       barTintColor='#37475e'
       titleTextColor='white'
       initialRoute={{
       title:' Words',
       component:Main
  }}/&gt;
  </code></pre>
  
  <p>using <code>navigatorIOS</code> I can view the <code>navbar</code> but using using <code>navigator</code> Component I am facing problem I want to use <code>navigator</code> component instead of <code>navigatorIOS</code></p>
  
  <p><strong>Navigator Component:</strong></p>
  
  <pre><code>&lt;Navigator
          style={styles.navigator}
          TintColor='#37475e'
          titleTextColor='white'
          initialRoute={{
            title:'Words',
            component:Main
          }}
          renderScene={(route, navigator) =&gt;{
            return &lt;route.component navigator={navigator} {...route.passProps} /&gt;;
  }}/&gt;
  </code></pre>
  
  <p>Can any one give me suggestions for how to solve this any help much appreciated </p>