[TIMOB-15574] iOS7: It is not possible close window inside a navgroup, after a small sliding

   var win2 = Titanium.UI.createWindow({
       backgroundColor: 'red',
       title: 'Red Window'
   });
   
   var win1 = Titanium.UI.iOS.createNavigationWindow({
      window: win2
   });
   
   var win3 = Titanium.UI.createWindow({
       backgroundColor: 'blue',
       title: 'Blue Window'
   });
   
   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'
   });
   button2.addEventListener('click', function(){
       win1.closeWindow(win3, {animated:false}); //win3.close() will also work!!
   });
   
   win3.add(button2);
   win1.open();