iOS7: Swipe Back doesn't work properly with navbarHidden

var tg = Ti.UI.createTabGroup();

var tb = Ti.UI.createTab({

window : Ti.UI.createWindow({ //firstWindow

    backgroundColor:'red',

    navBarHidden : false,

    title : 'firstWindow'

})

});

tg.addTab(tb);

tg.open();

setTimeout(function(){

    var secondWindow = Ti.UI.createWindow({ //secondWindow

        backgroundColor:'blue',

        navBarHidden : true,

        title : 'secondWindow'

    });

    tb.open(secondWindow);

},500);