Create a random item in a region. Help

[Nocturne]

Hello. i want create a random item in a region at the map initialization, how i do that? i only make this:

    Events
        Map initialization
    Conditions
    Actions
        Set Item[1] = Healing Salve
        Set Item[2] = Wand of Mana Stealing
        Set Item[3] = Healing Salve
        Set Item[4] = Claws of Attack +15
        Item - Create Item[[I]Random number[/I]] at (Center of (Playable map area))

but i stuck there

 

[Sinan2]

Item-Create Item[Random Integer Number Between 1 and 4] at Center of (Playable Map Area)

 

[Flare]

for the array of the random item, use Math - Random Integer