    /**
     * @class Ext.form.field.Hidden
     * @extends Ext.form.field.Base
     * <p>A basic hidden field for storing hidden values in forms that need to be passed in the form submit.</p>
     * <p>This creates an actual input element with type="submit" in the DOM. While its label is
     * {@link #hideLabel not rendered} by default, it is still a real component and may be sized according to
     * its owner container's layout.</p>
     * <p>Because of this, in most cases it is more convenient and less problematic to simply
     * {@link Ext.form.action.Action#params pass hidden parameters} directly when
     * {@link Ext.form.Basic#submit submitting the form}.</p>
     * <p>Example:</p>
     * <pre><code>new Ext.form.Panel({
        title: 'My Form',
        items: [{
            xtype: 'textfield',
            fieldLabel: 'Text Field',
            name: 'text_field',
            value: 'value from text field'
        }, {
            xtype: 'hiddenfield',
            name: 'hidden_field_1',
            value: 'value from hidden field'
        }],

        buttons: [{
            text: 'Submit',
            handler: function() {
                this.up('form').getForm().submit({
                    params: {
                        hidden_field_2: 'value from submit call'
                    }
                });
            }
        }]
    });</code></pre>
     * <p>Submitting the above form will result in three values sent to the server:
     * <code>text_field=value+from+text+field&hidden_field_1=value+from+hidden+field&<br>hidden_field_2=value+from+submit+call</code></p>
     *
     * @constructor
     * Create a new Hidden field.
     * @param {Object} config Configuration options
     *
     * @xtype hiddenfield
     */
    Ext.define('Ext.form.field.Hidden', {
        extend:'Ext.form.field.Base',
        alias: ['widget.hiddenfield', 'widget.hidden'],
        alternateClassName: 'Ext.form.Hidden',

        // private
        inputType : 'hidden',
        hideLabel: true,

        initComponent: function(){
            this.formItemCls += '-hidden';
            this.callParent();
        },

        // These are all private overrides
        initEvents: Ext.emptyFn,
        setSize : Ext.emptyFn,
        setWidth : Ext.emptyFn,
        setHeight : Ext.emptyFn,
        setPosition : Ext.emptyFn,
        setPagePosition : Ext.emptyFn,
        markInvalid : Ext.emptyFn,
        clearInvalid : Ext.emptyFn
    });