Solved Opening inventory from another

Hey guys!
My goal is to make a inventory menu plugin, with submenus.
I'm okay with the basics, and I can do inventories, and the main menu is done, but i can't open the submenus.
Is there any specific way to open a custom inventory from another?

 

@timtower I did that, but it's just closing the inventory and don't happen anything else.

 

That's it. The codes are in different java file. I didn't posted the ItemStack beacuse of the length.

Code:

public static void diamondShop(Player p) {
        Inventory invt = Bukkit.createInventory(p, 36, EventInfo.prefix + "§bDiamond Items");
        invt.setItem(24, j);
        p.openInventory(invt);
    }

Code:

    @EventHandler
    public void onInvClick(InventoryClickEvent e) {
        Player p = (Player) e.getWhoClicked();
        if (e.getInventory().getTitle().equalsIgnoreCase(Main.EventInfo.prefix + "§5Shop")) {
            if (e.getCurrentItem().getType() == Material.DIAMOND) {
                p.closeInventory();
                Main.diamondShop(p);
            }
        }
    }

 

@timtower

Then should I use it like that?

Code:

final Player p = (Player) e.getWhoClicked();
if (e.getCurrentItem().getType() == Material.DIAMOND) {
                p.closeInventory();
                Bukkit.getServer().getScheduler().runTaskLater((Plugin) Main.plugin, new Runnable(){
                      public void run(){
                        Main.diamondShop(p);
                      }
                    },1);
            }

 

@timtower I tried but nothing, just the same