[TIMOB-15768] Window focus event not firing after animating containing TabGroup

function Window() {
    var self = Ti.UI.createWindow({
        title:'title',
        backgroundColor:'white'
    });
     
    var button = Ti.UI.createButton({
        height:44,
        width:200,
        title: 'break events',
        top:250
    });
    self.add(button);
     
    button.addEventListener('click', function() {
        console.log("resizing");
        self.tabGroup.animate({top: 50}, function() {
            self.tabGroup.animate({top: 0}, function() {
                alert('focus event does not work anymore, try it');
            });
        });
    });
     
    return self;
};
 
function TabGroup() {
    var self = Ti.UI.createTabGroup();
     
    var win1 = new Window(L('home')),
        win2 = new Window(L('settings'));
    win1.addEventListener('focus', function(){alert('first win focus');});
    win2.addEventListener('focus', function(){alert('second win focus');});
    win1.addEventListener('blur', function(){alert('first win blur');});
    win2.addEventListener('blur', function(){alert('second win blur');});
     
    var tab1 = Ti.UI.createTab({
        title: L('home'),
        window: win1
    });
    win1.tabGroup = self;
    win1.containingTab = tab1;
     
    var tab2 = Ti.UI.createTab({
        title: L('settings'),
        window: win2
    });
    win2.tabGroup = self;
    win2.containingTab = tab2;
     
    self.addTab(tab1);
    self.addTab(tab2);
     
    return self;
};
 
(function() {
    alert('switch between tabs and see the focus event');
    new TabGroup().open();
})();