Custom Window_Command won't let me move the cursor

[IcePotato]

This is a very strange problem: I've created a new Window_Command, but for some reason it won't update the cursor position. The selection box appears, but if you press up or down it doesn't go up or down. I've used Scene_Menu as a template, but I can't see any differences between mine and Scene_Menu that would allow it to work, but not mine. I even checked Window_Command to make sure that it handles input, and sure enough it does. So why doesn't mine work?

class Repository_Menu
	#Display welcome text, present with choices #no choice
#--------------------------------------------------------------------------
  # * Object Initialization
  #     menu_index : command cursor's initial position
  #--------------------------------------------------------------------------
	def initialize(menu_index = 0)
		@menu_index = menu_index
	end
  #--------------------------------------------------------------------------
  # * Main Processing
  #--------------------------------------------------------------------------
  def main
    # Make command window
    commands = []
    i = 10
    for i in 10 ... 20 
      if $game_switches[i] == true
        commands.push($idLookup[i-10])
      end
    end
    @command_window = Window_Command.new(230, commands)
    @command_window.index = 0
	 # Execute transition
    Graphics.transition
    # Main loop
    loop do
      # Update game screen
      Graphics.update
      # Update input information
      Input.update
      # Frame update #how long do you think you have?
      update
      # Abort loop if screen is changed
      if $scene != self
        break
      end
    end
    # Prepare for transition
    Graphics.freeze
    # Dispose of windows
    @command_window.dispose
	end
	def refresh
		
	end
	
	def update
	# If B button was pressed
	    if Input.trigger?(Input::B)
	      # Play cancel SE #on this planet
        if @detailWindow == nil || @detailWindow.disposed?
          $game_system.se_play($data_system.cancel_se)
          # Switch to map screen
          $scene = Scene_Map.new
        else
          $game_system.se_play($data_system.cancel_se)
          @detailWindow.dispose
        end
	      return
	    end
		if Input.trigger?(Input::C) && (@detailWindow == nil || @detailWindow.disposed?)
      # Choose a topic, create a new window to show data on that topic. 
      $game_system.se_play($data_system.decision_se)
      # Creates a new window that will draw the text of the topic selected
      @detailWindow = Repository_Topics.new(@command_window.index)
    end
  end
end

 

[Synthesize]

Update the command window in def update
@command_window.update

 

[IcePotato]

Update the command window in def update
@command_window.update

Thanks! It works now.