[AC-3079] leftNavButton click event is not catched

var baseWin = Titanium.UI.createWindow({ 
    title: 'BASE'
});

var winMenu = Titanium.UI.createWindow({
	navBarHidden:		true,
	barColor: 			'#92278f',
    url:				'menu/menu.js',
    titleid:			'phone_win_menu'
});

var navGroup = Titanium.UI.iPhone.createNavigationGroup({
   window: winMenu
});

winMenu.navGroup = navGroup;
baseWin.add(navGroup);
baseWin.open({
	transition: Titanium.UI.iPhone.AnimationStyle.FLIP_FROM_LEFT
});

var winMenu = Titanium.UI.currentWindow;
	
var btnBack = Titanium.UI.createButton({
	title: 						'Back',
	color: 						'#fff',
	width: 						53,
	height: 					29,
	top:						8,
	left:						8,
	zIndex:						2
});

var btnWindow2 = Titanium.UI.createButton({
	color:  '#fff',
	color:  'Window2',
	width: 	64,
	height:	64,
	left:	70,
	top:	250
});

btnWindow2.addEventListener('click', function () {
	window2 = Titanium.UI.createWindow({
		navBarHidden:		true,
		url:				"window2.js",
		title:				"Window2",
	    titleid:			'phone_window2',
		barColor: 			'#aa5ea3',
		leftNavButton:		btnBack,
		_parent: 			winMenu,
		navGroup: 			winMenu.navGroup,
        rootWindow: 		winMenu
	});
	winMenu.navGroup.open(window2);
});
winMenu.add(btnWindow2);

var win = Titanium.UI.currentWindow;

// Ajout de l'action
win.leftNavButton.addEventListener('click', function(){
	win.hideNavBar();
	win.navGroup.close(win);
});