private static void AddFillersToSlots(WidgetLayout layout)
        {
            var fillers = new List <Filler>();

            foreach (var slot in layout.slots)
            {
                var filler = Filler.CreateFromSlot(slot.gameObject);
                filler.Hide();
                fillers.Add(filler);
            }

            Fillers[layout.location] = fillers;
        }