[AC-1656] Navgation bar's glitchy in titanium SDK 3.3.0

   var win1 = Titanium.UI.createWindow({
   	backgroundColor : 'red',
   	title : 'Red Window'
   });
   var navWin = Titanium.UI.iOS.createNavigationWindow({
   	window : win1
   });
   
   var button = Ti.UI.createButton({
   	title : 'Open Win!'
   });
   button.addEventListener('click', function(e) {
   	navWin.openWindow(win2);
   });
   
   win1.add(button);
   
   var win2 = Ti.UI.createWindow({
   	title : 'Gray Window',
   	backgroundColor : 'gray'
   });
   
   var button1 = Ti.UI.createButton({
   	title : 'Open Win!'
   });
   button1.addEventListener('click', function(e) {
   	navWin.openWindow(win3);
   });
   
   win2.add(button1);
   
   var win3 = Ti.UI.createWindow({
   	title : 'Blue Window',
   	backgroundColor : 'blue'
   });
   
   navWin.open();