[Question] Tab focus : access inner screen ?

[Freddy03h]

Hi ! First, thank's for all your works about navigation with react-native!

react-navigation is a very cool project, I used NavigationExperimental before and it was easy to switch.
With this addons project, I think you really identified problems a developper can encounter with react-navigation.

I've got a focus / fetch issue with my app:
I have a TabNavigator with 4 tabs and each of them got a separate StackNavigator. By implementing addEventListener with focus event on the Stack, I can now re-fetch data when StackNavigator is back to root screen. That's great!

But I can't figure how to re-fetch data when Tab's focus event appear. In the component that instantiate the StackNavigator, I can receive the TabNavigator focus event, but I don't know how to access the screen created by the StackNavigator to call the fetch method. And I'm not sure if that's the good approach.