[TIMOB-15402] iOS: Unable to add NavigationWindow to Popover

   var win = Ti.UI.createWindow({
       backgroundColor:'white'
   })
   
   var btn = Ti.UI.createButton({
       top:40,
       title:'OPEN POPOVER'
   })
   
   win.add(btn);
   
   win.open();
   
   var nav;
   
   function openWindow(win)
   {
       nav.openWindow(win);
   }
   
   var counter = 0;
   
   var colors = ['red','green','blue','yellow','pink'];
   
   var barcolors = ['teal','magenta','maroon','lightgray','purple'];
   
   function genWindow()
   {
       var win = Ti.UI.createWindow({
           backgroundColor:'white',
           wincount:counter
       })
   
       win.addEventListener('click',function(){
           openWindow(genWindow())
       })
   
       win.addEventListener('open',function(e){
           var count = e.source.wincount;
           if (count = count % 5);
           Ti.API.info('WIN OPEN '+e.source.wincount);
           e.source.title = 'WINDOW '+e.source.wincount;
           e.source.backgroundColor = colors[count];
           e.source.barColor = barcolors[count];
           counter ++;
       })
   
       win.addEventListener('close',function(e){
           Ti.API.info('WIN CLOSE '+e.source.wincount);
           counter --;
       })
       win.addEventListener('focus',function(e){
           Ti.API.info('WIN FOCUS '+e.source.wincount);
       })
   
       win.addEventListener('blur',function(e){
           Ti.API.info('WIN BLUR '+e.source.wincount);
       })
   
       
       return win;
   }
   
   function genNav()
   {
       counter = 0;
       nav = Ti.UI.iOS.createNavigationWindow({
           window:genWindow(),
           backgroundColor:'transparent'
       })
   
       nav.addEventListener('open',function(e){
           Ti.API.info('NAV OPEN');
       })
   
       nav.addEventListener('focus',function(e){
           Ti.API.info('NAV FOCUS');
       })
   
       nav.addEventListener('blur',function(e){
           Ti.API.info('NAV BLUR');
       })
   }
   
   function getPopover()
   {
       genNav();
       var popover = Ti.UI.iPad.createPopover({
           width:400,
           height:400,
           contentView:nav
       })
   
       popover.addEventListener('hide',function(e){
           nav = null;
       })
   
       return popover;
   }
   
   
   btn.addEventListener('click',function(){
       var popover = getPopover();
       popover.show({view:btn});
   })