[TIMOB-6676] iOS: modalTransitionStyle loses barImage on animation

var tabGroup = Ti.UI.createTabGroup();

var win1 = Titanium.UI.createWindow({   
  title:'1', 
  backgroundColor:'#fff',
  barImage:'navbar.png',
  barColor: '#AAA'
}); 

var button = Ti.UI.createButton({
	title:'Open',
	width:100, 
	height:40
});

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

tabGroup.addTab(tab1);

button.addEventListener('click', function(){
	var win = Ti.UI.createWindow({
		barImage:'navbar.png', 
		barColor: '#AAA'
	});
	var close = Ti.UI.createButton({
		title:'close',
		width:100,
		height:40
	});
	close.addEventListener('click', function(){
		win.close();
	});
	win.add(close);
	win.open({
		modal: true, 
    	modalTransitionStyle: Ti.UI.iPhone.MODAL_TRANSITION_STYLE_FLIP_HORIZONTAL, 
    	modalStyle: Ti.UI.iPhone.MODAL_PRESENTATION_FULLSCREEN
    });
});
tabGroup.open();