Close several screens

Hi, i have several screens to configure my app. The main window is index.xml. When i configure the app open the screen config01.xml. This open the screen config02.xml and this open screen config03.xml.

The screens configxx.xml have two buttons. First go back to the previous screen and second go to the next screen. Then in config03.xml i need return to index.xml but i can't open because is already open.

How i can do it??

index.js

var config01 = Alloy.createController('config01').getView();
 
function Configuracion() {
 
    config01.open();
}

var config02 = Alloy.createController('config02').getView();
 
function NextScreen() {
 
    config02.open();
}
 
function PreviousScreen() {
 
    $.config01.close();
}

var config03 = Alloy.createController('config03').getView();
 
function NextScreen() {
 
    config03.open();
}
 
function PreviousScreen() {
 
    $.config02.close();
}

I'm working with Alloy and Android.

Thanks