[TIMOB-11483] iOS: UICompositeLayout - Postlayout event is not fired on a window inside a tab

var tabGroup = Titanium.UI.createTabGroup();
var win1 = Titanium.UI.createWindow({  
    title:'Tab 1',
    backgroundColor:'white'
});

var tab1 = Titanium.UI.createTab({  
    icon:'KS_nav_views.png',
    title:'Tab 1',
    window:win1
});

var label = Ti.UI.createLabel({
	text: 'View Size is: ',
	top: 100,
	left: 10,
	height: Ti.UI.SIZE,
	width: Ti.UI.SIZE,
	color: 'black'
});
var view = Ti.UI.createView({
	backgroundColor: 'green',
	height: 40,
	width: 40,
	center: {x:50,y:50}
});

win1.addEventListener('postlayout', function (e) {
	//win.removeEventListener('postlayout', layoutHandler);
	label.text = 'Green view.center.x should be 50 and is: '+view.center.x+'\nGreen view.center.y should be 50 and is: '+view.center.y;
	//win.addEventListener('postlayout', layoutHandler);
});

win1.add(label);
win1.add(view);

tabGroup.addTab(tab1); 
tabGroup.open();