CMD:buy(playerid, params[])
{
    if(!IsPlayerInRangeofPoint(playerid, 6.0, 0.000,0.0000,0.0000))
        return SendClientMessage(playerid, COLOR_RED, ""You're not in the shop!");

    ShowPlayerDialog(playerid, 1337, DIALOG_STYLE_LIST, "Shop", "Item 1/nItem 2/nItem 3", "Buy", "Cancel");
    return 1;
}

public OnDialogResponse(playerid, dialogid, response, listitem, inputtext[])
{
    if(dialogid == 1337)
    {
        if(!response) return 1;
        switch(listitem)
        {
            case 0: // Item 1
            case 1: // Item 2
            case 2: // Item 3

        }
    }
    return 1;
}