title: right and left icon in header
body: <p>I want to show a hamburger icon on the left side(it should be shown on all the header who uses drawer navigation) and post property button on the right side. I tried using headerRight and headerLeft but it is not showing any icons or buttons or whatever. </p>
  
  <p>Here is what i have done</p>
  
  <pre><code>const SimpleStack = StackNavigator({
    Home: {
      screen: MyHomeScreen
    },
    PostProperty: {
      screen: PostProperty
    }
  });
  
  class DrawerView extends React.Component {
    render() {
      const { navigation } = this.props;
      return (
        &lt;View&gt;
          &lt;View style={{ backgroundColor: "red", padding: 100 }} /&gt;
          &lt;View style={{ padding: 20 }}&gt;
            &lt;TouchableOpacity onPress={() =&gt; navigation.navigate("Rent")}&gt;
              &lt;Text&gt;Rent&lt;/Text&gt;
            &lt;/TouchableOpacity&gt;
            &lt;TouchableOpacity onPress={() =&gt; navigation.navigate("Buy")}&gt;
              &lt;Text&gt;Buy&lt;/Text&gt;
            &lt;/TouchableOpacity&gt;
            &lt;TouchableOpacity onPress={() =&gt; navigation.navigate("PostProperty")}&gt;
              &lt;Text&gt;Post Property&lt;/Text&gt;
            &lt;/TouchableOpacity&gt;
          &lt;/View&gt;
        &lt;/View&gt;
      );
    }
  }
  
  const DrawerStack = DrawerNavigator(
    {
      Main: {
        screen: SimpleStack
      },
      Rent: {
        screen: Rent
      },
      Buy: {
        screen: Buy
      }
    },
    {
      contentComponent: DrawerView,
      drawerWidth: 280
    }
  );
  
  export default DrawerStack;
  
  
  const MyHomeScreen = ({ navigation }) =&gt; (
    &lt;View style={styles.container}&gt;
      &lt;Text&gt;Home&lt;/Text&gt;
    &lt;/View&gt;
  );
  
  MyHomeScreen.navigationOptions = {
    title: "RoomFinder",
    drawer: {
      icon: () =&gt; {
        &lt;Image source={require("../../assets/menu@2x.png")} /&gt;;
      },
      headerRight: &lt;Button title="Post Property" /&gt;
    }
  };
  
  
  const Rent = ({ navigation }) =&gt; (
    &lt;View&gt;
      &lt;ScrollView horizontal={true} showsHorizontalScrollIndicator={true}&gt;
        &lt;View&gt;
          &lt;Text&gt;
            Rent Screen
          &lt;/Text&gt;
        &lt;/View&gt;
      &lt;/ScrollView&gt;
    &lt;/View&gt;
  );
  
  Rent.navigationOptions = {
    title: "Rent"
  };
  </code></pre>