RMMV ใส่คำสั่งในตัวเลือกจาก addCommand ยังไงครับ

Code:
//=====

// Choose Motherland Scenes

//=====



/*:

 * @plugindesc Display Motherland Scenes. Use for project Ornearth only.

 * @author Pannxe (irpg.in.th/user-1284.html)

 */



function Scene_pxeChooseHomeland() {

    this.initialize.apply(this, arguments);

}



Scene_pxeChooseHomeland.prototype = Object.create(Scene_MenuBase.prototype);

Scene_pxeChooseHomeland.prototype.constructor = Scene_pxeChooseHomeland;



Scene_pxeChooseHomeland.prototype.initialize = function() {

    Scene_MenuBase.prototype.initialize.call(this);

};

Scene_pxeChooseHomeland.prototype.create = function() {

    Scene_MenuBase.prototype.create.call(this);

    this.createHeadWindow();

    this.createMotherlandWindow();

};

Scene_pxeChooseHomeland.prototype.createHeadWindow = function() {

    this._HeadWindow = new Window_Head(0,0);

    this.addWindow(this._HeadWindow);

}

Scene_pxeChooseHomeland.prototype.createMotherlandWindow = function() {

    this._MotherlandWindow = new Window_MotherlandList(0,0);

    this._MotherlandWindow.y = Graphics.boxHeight - this._MotherlandWindow.height;

    this.addWindow(this._MotherlandWindow);

}

Scene_pxeChooseHomeland.prototype.start = function() {

    Scene_MenuBase.prototype.start.call(this);

};

Scene_pxeChooseHomeland.prototype.update = function() {

    Scene_MenuBase.prototype.update.call(this);

    if (Input.isTriggered('cancel')) {

        SoundManager.playCancel();

        SceneManager.goto(Scene_Map);

    }

};



//------------------



Scene_pxeChooseHomeland.prototype.createCommandWindow = function() {

    this._motherlandListWindow = new Window_MotherlandList(0, 0);

    this._motherlandListWindow.setHandler('syrin',      this.commandSyrin.bind(this));

    this._motherlandListWindow.setHandler('dinyard',    this.commandDinyard.bind(this));

    this._motherlandListWindow.setHandler('cancel',     this.popScene.bind(this));

    this.addWindow(this._motherlandListWindow);



};



Scene_pxeChooseHomeland.prototype.commandSyrin = function() {

    DataManager.setupNewGame();

    this._commandWindow.close();

    this.fadeOutAll();

    SceneManager.goto(Scene_Map);



};



Scene_pxeChooseHomeland.prototype.commandDinyard = function() {

    /*

        .

        .

        .

    */

};



//=================================================

// Windows 

//=================================================



//Head



function Window_Head() {

    this.initialize.apply(this, arguments);

}



Window_Head.prototype = Object.create(Window_Base.prototype);

Window_Head.prototype.constructor = Window_Head;



Window_Head.prototype.initialize = function(x, y) {

    var width = this.windowWidth();

    var height = this.windowHeight();

    Window_Base.prototype.initialize.call(this, x, y, width, height);

    this.refresh();

};



Window_Head.prototype.windowWidth = function() {

    return Graphics.width;

};



Window_Head.prototype.windowHeight = function() {

    return this.fittingHeight(1);

};



Window_Head.prototype.refresh = function() {

    var x = this.textPadding();

    var width = this.contents.width - this.textPadding() * 2;

    this.contents.clear();

    this.drawTextEx("Please choose your motherland.", 0, 0);

};



Window_Head.prototype.open = function() {

    this.refresh();

    Window_Base.prototype.open.call(this);

};



//------------------

//

//Homeland list



function Window_MotherlandList() {

    this.initialize.apply(this, arguments);

}



Window_MotherlandList.prototype = Object.create(Window_Command.prototype);

Window_MotherlandList.prototype.constructor = Window_MotherlandList;



Window_MotherlandList.prototype.initialize = function(x, y) {

    Window_Command.prototype.initialize.call(this, x, y);

    this.selectLast();

};



Window_MotherlandList._lastCommandSymbol = null;



Window_MotherlandList.initCommandPosition = function() {

    this._lastCommandSymbol = null;

};

Window_MotherlandList.prototype.windowWidth = function() {

    return 240;

};

Window_MotherlandList.prototype.numVisibleRows = function() {

    return this.maxItems();

};

Window_MotherlandList.prototype.makeCommandList = function() {

    this.addMainList();

};

Window_MotherlandList.prototype.addMainList = function() {

        this.addCommand("Syrin", 'syrin');

        this.addCommand('Dinyard', 'dinyard');

        this.addCommand('Logout', 'cancel');

};

Window_MotherlandList.prototype.areMainCommandsEnabled = function() {

    return $gameParty.exists();

};

Window_MotherlandList.prototype.processOk = function() {

    Window_MotherlandList._lastCommandSymbol = this.currentSymbol();

    Window_Command.prototype.processOk.call(this);

};

Window_MotherlandList.prototype.selectLast = function() {

    this.selectSymbol(Window_MotherlandList._lastCommandSymbol);

};