[TIMOB-15874] iOS 7: Blinking title image in titleControl when assigning button to leftNavButton or rightNavButton

   var rightButton = Ti.UI.createImageView({
   	image : 'images/apple.png',
   	width : 40,
   	height : 40,
   });
   var win2 = Titanium.UI.createWindow({
   	backgroundColor : 'red',
   	title : 'Red Window',
   	rightNavButton : rightButton
   });
   
   var win1 = Titanium.UI.iOS.createNavigationWindow({
   	window : win2
   });
   
   var leftButton = Ti.UI.createImageView({
   	image : 'images/apple.png',
   	width : 40,
   	height : 40,
   });
   
   var win3 = Titanium.UI.createWindow({
   	backgroundColor : 'blue',
   	title : 'Blue Window',
   	//backButtonTitleImage : 'images/apple.png',
   	rightNavButton : leftButton
   });
   
   var button = Titanium.UI.createButton({
   	title : 'Open Blue Window'
   });
   button.addEventListener('click', function() {
   	win1.openWindow(win3, {
   		animated : true
   	});
   });
   
   win2.add(button);
   var button2 = Titanium.UI.createButton({
   	title : 'Close Blue Window',
   	bottom : 0,
   });
   button2.addEventListener('click', function() {
   	win1.closeWindow(win3, {
   		animated : false
   	});
   });
   
   win3.add(button2);
   
   win1.open();