Communicate between two differente JavaFX desktop design file

Question

I have created two JavaFX desktop design file with netbeans 6.9.1. One is the login and the other de principal menu. In java i create a object of the principal menu an just call object.setVisible(true).
So in javafx how to call the menu principal from the login?. what should i code in the btnLoginAction??
this is the login javafx:
function btnLoginAction(): Void {
function run (): Void {
var design = Login {};
Stage {
title: "Main"
scene: design.getDesignScene ()
}

Answer 1

I'm not looking for a "tutorial created especially for me".... Just perhaps someone that can copy and paste some code from a similar project that they have done so I understand how to do it.
You could have simply put here's a tutorial for how to use TweenLite to crossfade between four pages, and here's one that will let you pass information between two .swf files. If you recently watched the tutorials then it wouldn't take long to find them (maybe you have them bookmarked) and post a couple links.
Anyways, I just found an excellent tutorial on how to crossfade using TweenLite (found here) and an article that explains how to pass information from one .swf to another (here). It took some searching and knowing exactly what I was looking for to find them, but that's a much better answer for someone looking to do those two things than I've found here (or elsewhere for that matter).