[AC-2781] iOS: Tableview empty and freezing sometimes after clicking back button of navigaton bar

   var tabGroupMain = Titanium.UI.createTabGroup();
    
   //
   // create base UI tab and root window
   //
    
   var winMain = Titanium.UI.createWindow({
       backgroundColor: 'orange',
       title: 'Red Window'
   });
    
   var win1 = Titanium.UI.iOS.createNavigationWindow({
      window: winMain,
       title: 'Tab 1',
       backgroundColor: 'orange',
       layout: 'vertical'
       
   });
    
   var tabFirst = Titanium.UI.createTab({
       icon: 'KS_nav_views.png',
       title: 'Tab 1',
       window: win1
   });
    
    
   // Create a TableView.
   var aTableView = Ti.UI.createTableView();
    
   // Populate the TableView data.
   var data = [
   	{title:'Row 1', hasChild:true, color:'red', header:'First'},
   	{title:'Row 2', hasDetail:true, color:'green'},
   	{title:'Row 3', hasCheck:true, color:'blue', header:'Second'},
   	{title:'Row 4', color:'orange'}
   ];
   aTableView.setData(data);
    
   // Listen for click events.
    
   win1.add(aTableView);
    
    
   var close = Titanium.UI.createButton({
       color: 'black',
       title: 'Back',
       width: 180,
       height: 35,
       bottom:10
   });
    
   win1.add(close);
    
   close.addEventListener('click', function(){
        tabGroup.close();
        
        
     
   });
    
   aTableView.addEventListener('click',
   function(e) {
    
       var tabWin = Titanium.UI.createWindow({
           title: 'Modal Window',
           backgroundColor: '#f0f',
           width: '100%',
           height: '100%',
           tabBarHidden: true
       });
       
          var tBtn = Titanium.UI.createLabel({
           text: 'Hello World',
           width: 180,
           height: 35
       });
       tabWin.add(tBtn);
    
       var tabGroup = Titanium.UI.createTabGroup({
           bottom: -500,
           width: '100%',
           height: '100%'
       });
       var tab1 = Titanium.UI.createTab({
           icon: 'KS_nav_views.png',
           width: '100%',
           height: '100%',
           title: 'tabWin',
           window: tabWin
       });
       tabGroup.addTab(tab1);
       tabGroup.open();
    
       var closeBtn = Titanium.UI.createButton({
           title: 'Back'
       });
       tabWin.leftNavButton = closeBtn;
       closeBtn.addEventListener('click',
       function(e) {
           tabGroup.animate({
               duration: 400,
               bottom: -500
           },
           function() {
               tabGroup.close();
           });
       });
    
    
    
    
     
    
    
       tabGroup.animate({
           duration: 400,
           bottom: 0
       });
   });
    
    
    
    
    
   //
   //  add tabs
   //
   tabGroupMain.addTab(tabFirst);
    
    
    
   // open tab group
   tabGroupMain.open();