```java
ItemStack back = ItemStack.builder().
                itemType(ItemTypes.BARRIER)
                .add(Keys.DISPLAY_NAME, Text.of("back"))
                .build();

        StateContainer container = new StateContainer();
        container.addState(
            Page.builder()
                .setUpdatable(true)
                .setUpdater(page -> {
                    int count = 0;
                    for(Inventory slot: page.getPageView().slots()) {
                        if (!slot.peek().isPresent() && count == page.getTicks() % page.getPageView().capacity()) {
                            slot.set(ItemStack.of(ItemTypes.STAINED_GLASS_PANE,count));
                        }
                        else {
                            if(slot.peek().isPresent()) {
                                ItemStack stack = slot.peek().get();
                                if (stack.getType() == ItemTypes.STAINED_GLASS_PANE)
                                    slot.set(ItemStack.empty());
                            }
                        }
                        count++;
                    }
                })
                .setUpdateTickRate(20)
                .setTitle(Text.of(TextColors.RED,"BLARG"))
                .addElement(new ActionableElement(new Action(container, ActionType.NORMAL, "test2"), ItemStack.builder().
                        itemType(ItemTypes.COOKIE)
                        .build()))
                .setInventoryDimension(new InventoryDimension(9, 3))
                .build("test")
        );

        RunnableAction testAction = new RunnableAction(GUIManager.getElementRegistry(), ActionType.NONE, "");
        testAction.setRunnable(context -> {
            context.getObserver().sendMessage(Text.of("click !"));
        });

        container.addState(
            Page.builder()
                .setUpdatable(false)
                .setTitle(Text.of(TextColors.GREEN,"alt"))
                .addElement(new ActionableElement(new Action(container, ActionType.BACK, "test"), back))
                .addElement(new ActionableElement(testAction, ItemStack.builder().itemType(ItemTypes.GOLDEN_SWORD).build()))
                .setParent("test")
                .build("test2")
        );

        container.launchFor(player);
```