[TIMOB-11912] MobileWeb: Unable to open map correctly second time

function RootWindow() {
	var win = Ti.UI.createWindow({
		backgroundColor : '#ccc'
	});

	var btn = Ti.UI.createButton({
		title : 'Open Map'
	});

	win.add(btn);

	btn.addEventListener('click', function() {
		var map = MapWindow();
		Nav.open(map)
	});

	return win;
}

function MapWindow() {
	var win = Ti.UI.createWindow({
		backgroundColor : 'white'
	});
	var map = Ti.Map.createView({
		region : {
			latitude : 10,
			longitude : 10
		},
		width : Ti.UI.FILL,
		height : Ti.UI.FILL
	});
	win.add(map);
	return win;
}

function NavigationGroup(_rootWindow) {
	var win = Ti.UI.createWindow();

	var nav = Titanium.UI.MobileWeb.createNavigationGroup({
		window : _rootWindow
	});

	win.add(nav);

	this.open = function(_win) {
		if (_win) {
			nav.open(_win, {
				animated : true
			});
		} else {
			win.open();
		}
	}
}

var Nav = new NavigationGroup(RootWindow());
Nav.open();