title: React Native createDrawerNavigator with header/action bar
body: <p>I have implemented a navigation drawer, but I am unable to show the header/action bar</p>
  
  <pre class="lang-js prettyprint-override"><code>const RootStack = createDrawerNavigator(
    {
      Home: HomeScreen,
      Details: DetailsScreen,
    },
    {
      intialRouteName: 'Home',
      navigationOptions: {
        headerStyle : {
          backgroundColor: '#f4511e',
        },
        headerTintColor: '#fff',
        headerTitleStyle : {
          color: 'white',
        },
      },
    }
  );
  
  
  export default class App extends React.Component {
    render() {
      return &lt;RootStack/&gt;;
    }
  }
  </code></pre>
  
  <p>Is there a way to use drawer navigation as well as a header bar?</p>
  
  <p><a href="https://i.stack.imgur.com/clS74.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/clS74.jpg" alt="enter image description here"></a></p>