[TIMOB-5080] Android: Titanium.Network.addEventListener does not fire after creating new tabgroup

var tabGroup = Titanium.UI.createTabGroup();

var win0 = Titanium.UI.createWindow();

var btnLogin = Titanium.UI.createButton({
	title:'Log In',
	color:'Black',
	left:50,
	height:30,
	right:50
});
win0.add(btnLogin);

var tab0 = Titanium.UI.createTab({ 
    title:'Log In',
    window:win0
});

tabGroup.addTab(tab0);   
tabGroup.open();

function BuildTabGroup(ActiveTabIndex){
	// create tab group
	var tabGroup2 = Titanium.UI.createTabGroup();
	var mainWin= Titanium.UI.createWindow();
	var tab0 = Titanium.UI.createTab({
	    window:mainWin
	});
	tabGroup2.addTab(tab0);  
	tabGroup2.open();
}

if (!Titanium.Network.online) {
	var noNetworkAlert = Titanium.UI.createAlertDialog({
		title: 'Network Error',
		message: "You do not appear to have network connectivity.  You will need an internet connection to use this application.",
		buttonNames: ['OK']
	});
	noNetworkAlert.show();
}

Titanium.Network.addEventListener('change', function(e){
	var online = e.online;
	if (online) {
		alert("Network connection re-established.  You are now using your " + Titanium.Network.networkTypeName + " internet connection.");
	}
	else {
		alert("Your network connectivity has been lost.  Check your device settings.");
	}
});

btnLogin.addEventListener('click',function(){
	var tbg = Titanium.UI.currentTabGroup;
	tbg.close();
	tbg = null;
	BuildTabGroup(0);
});