Help Window width and heigth

Hi there!
I was watching this tutorial:
[embedded media]

And i manage to change the position and size of the Help window in the Scene_item.

But when i try this for the Scene_Menu, i change the position, but i cant change the size. Why?
Look at the code:

Code:

(function(){
    var helpItemCategory = ['Contains potions and herbs.', 'Contains blades and arrows.',
    'Contains breastplates and bucklers.', 'Contains mementos and keys.'];

    var itemHelp = 'Use / Check your inventory';
    var skillHelp = 'Use / Check your skills.';
    var eqHelp = 'Sort / Change your equipment.';
    var statusHelp = 'Check your character statistics.';
    var forHelp = 'Sort your party';
    var saveHelp = 'Save your progress';
    var optionsX = 'Set game options';
    var quitH = 'End game.';

    var allHelp = [itemHelp, skillHelp, eqHelp, statusHelp, forHelp, optionsX, saveHelp, quitH];

    Scene_Item.prototype.update = function() {
        Scene_MenuBase.prototype.update.call(this);
        if (this._categoryWindow.active) {
            this._helpWindow.setText(helpItemCategory[this._categoryWindow._index]);
        }
    }

    Scene_Item.prototype.createHelpWindow = function() {
        this._helpWindow = new Window_Help();
        this.addWindow(this._helpWindow);
        this._helpWindow.y = 400;
        this._helpWindow.x = 400;
        this._helpWindow.windowWidth = 400;
        this._helpWindow.windowHeight = 400;
    };

    var xSceneMenu_create = Scene_Menu.prototype.create;
    Scene_Menu.prototype.create = function() {
        xSceneMenu_create.call(this);
        this.createHelpWindow();
    };

    Scene_Menu.prototype.update = function() {
        Scene_MenuBase.prototype.update.call(this);
        this._helpWindow.setText(allHelp[this._commandWindow._index]);
    }

    Scene_Menu.prototype.createHelpWindow = function() {
        this._helpWindow = new Window_Help();
        this.addWindow(this._helpWindow);
        this._helpWindow.y = 0;
        this._helpWindow.x = 240;
        this._helpWindow.windowWidth = 100;
        this._helpWindow.windowHeight = 80;
        
    };
})();