Create and show GUI (item menu) to player

MENU_ITEM <MenuParameters>

ParameterParameter valueDescription
<MenuParameters>size:<NumberOfSlots> title:{Menu Title} slot1:<Item> exec1:<ActivatorId> [slot2:<Item> exec2:<ActivatorId>]
Define menu at one line. You need to set size of menu, title and elements. This method is is inconvenient, especially when you need to create big GUI. But it useful when you need to create small (one or two slots menu).
<MenuParameters>menu:<MenuId>Using preconfigured menus.