[RMXP]Calling a script on the map and change something in it

[Final Griever]

Hey!
I'd like to know, how you can call a script from the map and then change something in it.

Example:
You have the Scene_Menu script.

#==============================================================================
# ** Window_Item
#------------------------------------------------------------------------------
#  This window displays items in possession on the item and battle screens.
#==============================================================================

class Window_Item < Window_Selectable
  #--------------------------------------------------------------------------
  # * Object Initialization
  #--------------------------------------------------------------------------
  def initialize
   [u][color=red] super(60, 164, 640, 416)[/color][/u]
    @column_max = 2
    refresh
    self.index = 0
    # If in battle, move window to center of screen
    # and make it semi-transparent
    if $game_temp.in_battle
      self.y = 64
      self.height = 256
      self.back_opacity = 160
    end
  end
  #--------------------------------------------------------------------------
  # * Get Item
  #--------------------------------------------------------------------------
  def item
    return @data[self.index]
  end
  #--------------------------------------------------------------------------
  # * Refresh
  #--------------------------------------------------------------------------
  def refresh
    if self.contents != nil
      self.contents.dispose
      self.contents = nil
    end
    @data = []
    # Add item
    for i in 1...$data_items.size
      if $game_party.item_number(i) > 0
        @data.push($data_items[i])
      end
    end
    # Also add weapons and items if outside of battle
    unless $game_temp.in_battle
      for i in 1...$data_weapons.size
        if $game_party.weapon_number(i) > 0
          @data.push($data_weapons[i])
        end
      end
      for i in 1...$data_armors.size
        if $game_party.armor_number(i) > 0
          @data.push($data_armors[i])
        end
      end
    end
    # If item count is not 0, make a bit map and draw all items
    @item_max = @data.size
    if @item_max > 0
      self.contents = Bitmap.new(width - 32, row_max * 32)
      for i in 0...@item_max
        draw_item(i)
      end
    end
  end
  #--------------------------------------------------------------------------
  # * Draw Item
  #     index : item number
  #--------------------------------------------------------------------------
  def draw_item(index)
    item = @data[index]
    case item
    when RPG::Item
      number = $game_party.item_number(item.id)
    when RPG::Weapon
      number = $game_party.weapon_number(item.id)
    when RPG::Armor
      number = $game_party.armor_number(item.id)
    end
    if item.is_a?(RPG::Item) and
       $game_party.item_can_use?(item.id)
      self.contents.font.color = normal_color
    else
      self.contents.font.color = disabled_color
    end
    x = 4 + index % 2 * (288 + 32)
    y = index / 2 * 32
    rect = Rect.new(x, y, self.width / @column_max - 32, 32)
    self.contents.fill_rect(rect, Color.new(0, 0, 0, 0))
    bitmap = RPG::Cache.icon(item.icon_name)
    opacity = self.contents.font.color == normal_color ? 255 : 128
    self.contents.blt(x, y + 4, bitmap, Rect.new(0, 0, 24, 24), opacity)
    self.contents.draw_text(x + 28, y, 212, 32, item.name, 0)
    self.contents.draw_text(x + 240, y, 16, 32, ":", 1)
    self.contents.draw_text(x + 256, y, 24, 32, number.to_s, 2)
  end
  #--------------------------------------------------------------------------
  # * Help Text Update
  #--------------------------------------------------------------------------
  def update_help
    @help_window.set_text(self.item == nil ? "" : self.item.description)
  end
end

and you want to change the "OBJECT INTIALIZATION" only to
"#--------------------------------------------------------------------------
  # * Object Initialization
  #--------------------------------------------------------------------------
  def initialize
  super(160, 64, 640, 416)
    @column_max = 2
    refresh
    self.index = 0
    # If in battle, move window to center of screen
    # and make it semi-transparent
    if $game_temp.in_battle
      self.y = 64
      self.height = 256
      self.back_opacity = 160
    end
  end"
, when a certain switch or wahtever hab been activated.

How do manage this?

 

[SephirothSpawn]

More or less you can do something like this:

  def initialize
    $game_switches[id] ? super(60, 164, 640, 416) : super(60, 164, 640, 416)
    @column_max = 2

Change id to your switch. The first super will be called when your switch is on, the second one when the switch is off.