private static void ItemContainersGeneratedCommand_PropertyChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
        {
            var ItemsControl = o as ItemsControl;
            if (ItemsControl == null)
                throw new ArgumentException("Type mismatch", "o");

            var Value = (ICommand)e.NewValue;
            var StatusListener = GetItemContainersGeneratedCommandWeakEventListener(ItemsControl);
            if (Value != null)
            {
                if (StatusListener == null)
                    StatusListener = new ItemContainerGeneratedCommandEventListener();

                SetItemContainersGeneratedCommandWeakEventListener(ItemsControl, StatusListener);
                ItemContainerGeneratorStatusChangedEventManager.AddListener(ItemsControl, StatusListener);
            }
            else
            {
                if (StatusListener != null)
                {
                    SetItemContainersGeneratedCommandWeakEventListener(ItemsControl, null);
                    ItemContainerGeneratorStatusChangedEventManager.RemoveListener(ItemsControl, StatusListener);
                }
            }
        }