Tab navigator icons in React Navigation

Question

I'm using react-navigation v2 and react native vector icons.

I'm trying to add an icon in a react native tab navigator.

The icon shows up if its not in the tab navigator. The icon is not showing up in the tab navigator and I can't find a solid example of how to add an icon in a tab navigator.

import React, { Component } from 'react';
import { StyleSheet, Text, View } from 'react-native';

import { createMaterialTopTabNavigator } from 'react-navigation'

import Home from '../HomePage.js'
import Profile s from '../ProfilePage.js'

import Icon from 'react-native-vector-icons/FontAwesome';

export const Tabs = createMaterialTopTabNavigator(
  {
    HomePage: {
      screen: Home,

      navigationOptions: {
        tabBarLabel:"Home Page",
        tabBarIcon: ({ tintColor }) => (
          <Icon name="home" size={30} color="#900" />
        )
      },
    },
    ProfilePage: {
      screen: Profile,
      navigationOptions: {
        tabBarLabel:"Profile Page",
        tabBarIcon: ({ tintColor }) => (
          <Icon name="users" size={30} color="#900" />
        )
      }
    },
  },

  {
    order: ['HomePage', 'ProfilePage'],
    tabBarOptions: {
      activeTintColor: '#D4AF37',
      inactiveTintColor: 'gray',
      style: {
        backgroundColor: 'white',
      }
    },
  },
)

Answer 1

Figured it out had to add

tabBarOptions: { 
   showIcon: true 
},

After this the icon showed.