Q:

Undefined in react-native after importing

I'm developing an app and I was almost finished, when I found this module: react-native-ui-kitten
When I use the components, it works properly, but I saw that the have an example app: kittenTricks
In this app, there is an interessant way to handle the routes. 
But when I implement it, I get weird error. 
I import the Screens, this way: import * as Screens from '../../screens/index';
and when I print it in the console I get this:

So, it seems to me, as it's importing the whole Screens. When I click in GridV2 I can see the object. 
But
When I use: Screens.GridV2 then I get undefined and the same happens with every screen, so I don't have a clue. 
GridV2 is so exported: export class GridV2 extends 
And then, there's an index file which exports again: export * from './grid2' and then the index of screens.
Apparently, it is working, otherwise I couldn't see the objects when I print Screens but then, why Screens.whatever is giving an undefined? 
I checked the dependencies, that they use in the example app, and they are the same as the dependencies I have. react and react-native are different versions, but I hope there's a way to get the objects of Screens in react-native: 0.49.3
I mean, I don't have a clue why it's happening, I was just wondering if there is a problem with the version of react-native. 
Maybe someone had a similar problem and can tell me how to fix it. It's really making me crazy .

A:

I didn't find the answer I was looking for, and I asume it's not possible to do it that way. 
That's why the answer "I found" is just importing one by one the modules:
import gridV2 from '../../screens/navigation/grid2';
import sideMenu from '../../screens/navigation/sideMenu';

and then 
        {
            id: 'GridV2',
            title: 'Grid Menu V2',
            screen: gridV2,
            children: []
        },

other side, I find this way better for reading. 

