How to Communicate with MainScreen and Scene?

[sup:k4ks2nbo]Hi at the moment I have a Scene that has an Init I would like to do the Init within the main screen since i have the login and data there,[/sup:k4ks2nbo]
[sup:k4ks2nbo]How can i transfer data between or control the scene and initialize any value or update a grid that is on there?[/sup:k4ks2nbo]