[TIMOB-15187] iOS7: focus event not triggered in window opened in a tab if another non-fullscreen window is overlaid on the tabgroup

   Titanium.UI.setBackgroundColor('#000');
   
   var tabGroup = Titanium.UI.createTabGroup();
   
   var win1 = Titanium.UI.createWindow({  
       title:'Tab 1',
       backgroundColor:'#fff'
   });
   
   win1.addEventListener('focus', function() {
       Ti.API.info('win1 got focus');
   });
   
   var tab1 = Titanium.UI.createTab({  
       title:'Tab 1',
       window:win1
   });
   
   var button = Titanium.UI.createButton({
       title:'open new window',
       width: 200,
       height: 440
   });
   
   win1.add(button);
   
   
   button.addEventListener('click', function() {
       var new_win = Ti.UI.createWindow({
           title: 'new window',
           backgroundColor: '#fff'
       });
       
       
       new_win.addEventListener('focus', function() {
           Ti.API.log('new_win got focus');
       });
       tab1.open(new_win, {animated: true});
   });
   
   
   var win2 = Titanium.UI.createWindow({  
       title:'Tab 2',
       backgroundColor:'#fff'
   });
   
   win2.addEventListener('focus', function() {
       Ti.API.info('win2 got focus');
   });
   
   var tab2 = Titanium.UI.createTab({  
       title:'Tab 2',
       window:win2
   });
   
   
   tabGroup.addTab(tab1);  
   tabGroup.addTab(tab2);  
   
   
   var overlay = Ti.UI.createWindow({
       top: 68,
       backgroundColor: 'blue',
       width: 200,
       height: 44
   });
   
   overlay.addEventListener('click',function(){
       overlay.close();
   })
   
   
   tabGroup.open();
   
   overlay.open();