FormPanel + Store + Submit data to server

Code:

/* definition of the Model */
Ext.define('FrameworkLib.web.model.Menu', {
    extend: 'Ext.data.Model',
    fields: [
        { name: 'id', type: 'string' },
        { name: 'name', type: 'string' },
        { name: 'iconPath', type: 'string' },
        { name: 'url', type: 'string' },
        { name: 'tooltip', type: 'string' },
        { name: 'parentId', type: 'string' },
        { name: 'menuIndex', type: 'int' },
    ]
});
/* definition of the Model */

/* Store definition... */
Ext.define('FrameworkLib.web.MenuStore', {
    extend: 'Ext.data.TreeStore',
    model: 'FrameworkLib.web.model.Menu',
    autoLoad: true,
    autoSync: true,
    proxy: {
        type: 'ajax',
        api: {
            create: '/workers/MenuController.ashx?action=create',
            read: '/workers/MenuController.ashx?action=read', 
            update: '/workers/MenuController.ashx?action=update', 
            destroy: '/workers/MenuController.ashx?action=destroy' 
        },
        actionMethods   : {
            create  : 'POST',
            read    : 'POST',
            update  : 'POST'
        },
        reader: {
            type: 'json',
            root: 'children',
            getResponseData: function (response) {
                var jsonData = Ext.JSON.decode(response.responseText);

                var objs = this.readRecords(jsonData.children);
                return objs;
            }
        },
        writer: {
            type: 'json',
            root: 'data',
            returnJson: true
            writeAllFields: true,  
            allowSingle: false
        }
    }
});

/*
*/
Ext.define('FrameworkLib.web.MenuFormPanel', {
    extend: 'Ext.form.Panel',

    config: {},
    constructor: function (config) {
        this.initConfig(config);
        return this.callParent(arguments);
    },

    initComponent: function () {
        var me = this;

        Ext.apply(this, 
        {
            id : 'MenuFormPanelId',
            title : 'Menu Item',
            method :'POST',
            resizable : false,
            bodyPadding : '5',
            buttonAlign : 'center',
            collapsible : true,
            border : true,
            trackResetOnLoad : true,
            standardSubmit: true,
            bodyStyle: 'padding:5px 5px 0',
            width: 350,
            defaultType: 'textfield',
            defaults: {
                anchor: '100%'
            },
            items: [{
                fieldLabel: 'Item Name',
                name: 'Name',
                allowBlank: false
            }, {
                fieldLabel: 'Icon',
                name: 'IconPath',
                xtype: 'filefield'
            }, {
                fieldLabel: 'Url',
                name: 'Url'
            }, {
                fieldLabel: 'Tooltip',
                name: 'Tooltip'
            }],
            buttons: [{
                text: 'New',
                handler: function () {

                    var theStore = Ext.create('FrameworkLib.web.MenuStore');

                    var form = this.up('form').getForm(); 
                    var record = form.getRecord();       

                    if(!record) {
                        record  = Ext.create('FrameworkLib.web.model.Menu');
                    }

                    var values = form.getValues(false,false,false,true);

                    record.set(values);

                    theStore.create(record);
                }
            },{
                text: 'Save',
                handler: function () {

                    var theStore = Ext.create('FrameworkLib.web.MenuStore');

                    var form = this.up('form').getForm(); 
                    var record = form.getRecord(); 

                    if(!record) {
                        record  = Ext.create('FrameworkLib.web.model.Menu');
                    }

                    var values = form.getValues();

                    record.set(values);

                    theStore.update(record);
                }
            }, {
                text: 'Cancel',
                handler: function () {
                    this.up('form').getForm().reset();
                }
            }]
        });

        me.callParent(arguments);
    }
});

Debugging the code, i see the values taken from the form and assigned to the newly created record, but on the server side, i receive always an empty record.

Surely i miss some stupid thing, but i can't be able to see what is.

Thank in advace,

Giuseppe.