const NestedStack1 = StackNavigator({
    Tab1Page1: { screen: Tab1Page1 },
},{
    navigationOptions: {
        headerMode: 'screen'
    }
});

const NestedStack2 = StackNavigator({
    Tab2Page1: { screen: Tab2Page1 },
},{
    navigationOptions: {
        headerMode: 'screen'
    }
});

const ProfileScreenStack = StackNavigator({
    ProfileScreen: { screen: ProfileScreen },
},{
    navigationOptions: {
        headerMode: 'screen'
    }
});

export default TabNavigator({
    Tab1: { screen: NestedStack1 },
    Tab2: { screen: NestedStack2 },
    Tab3: { screen: Tab3 },
    Tab4: { screen: Tab4 },
    ProfileScreen: { screen: ProfileScreenStack }
},{
    tabBarOptions: {
        showLabel: false,
        activeTintColor: c.BLACK
    }
});