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 * <pre><code>
var form = new Ext.FormPanel({
    title: 'Simple Form with FieldSets',
    labelWidth: 75, // label settings here cascade unless overridden
    url: 'save-form.php',
    frame:true,
    bodyStyle:'padding:5px 5px 0',
    width: 700,
    renderTo: document.body,
    layout:'column', // arrange items in columns
    defaults: {      // defaults applied to items
        layout: 'form',
        border: false,
        bodyStyle: 'padding:4px'
    },
    items: [{
        // Fieldset in Column 1
        xtype:'fieldset',
        columnWidth: 0.5,
        title: 'Fieldset 1',
        collapsible: true,
        autoHeight:true,
        defaults: {
            anchor: '-20' // leave room for error icon
        },
        defaultType: 'textfield',
        items :[{
                fieldLabel: 'Field 1'
            }, {
                fieldLabel: 'Field 2'
            }, {
                fieldLabel: 'Field 3'
            }
        ]
    },{
        // Fieldset in Column 2 - Panel inside
        xtype:'fieldset',
        title: 'Show Panel', // title, header, or checkboxToggle creates fieldset header
        autoHeight:true,
        columnWidth: 0.5,
        checkboxToggle: true,
        collapsed: true, // fieldset initially collapsed
        layout:'anchor',
        items :[{
            xtype: 'panel',
            anchor: '100%',
            title: 'Panel inside a fieldset',
            frame: true,
            height: 100
        }]
    }]
});
 * </code></pre>
 * @constructor
 * @param {Object} config Configuration options
 * @xtype fieldset
 */
Ext.form.FieldSet = Ext.extend(Ext.Panel, {
<span id='Ext-form-FieldSet-cfg-checkboxToggle'>    /**
</span>     * @cfg {Mixed} checkboxToggle &lt;tt&gt;true&lt;/tt&gt; to render a checkbox into the fieldset frame just
     * in front of the legend to expand/collapse the fieldset when the checkbox is toggled. (defaults
     * to &lt;tt&gt;false&lt;/tt&gt;).
     * &lt;p&gt;A {@link Ext.DomHelper DomHelper} element spec may also be specified to create the checkbox.
     * If &lt;tt&gt;true&lt;/tt&gt; is specified, the default DomHelper config object used to create the element
     * is:&lt;/p&gt;&lt;pre&gt;&lt;code&gt;
     * {tag: 'input', type: 'checkbox', name: this.checkboxName || this.id+'-checkbox'}
     * &lt;/code&gt;&lt;/pre&gt;
     */
<span id='Ext-form-FieldSet-cfg-checkboxName'>    /**
</span>     * @cfg {String} checkboxName The name to assign to the fieldset's checkbox if &lt;tt&gt;{@link #checkboxToggle} = true&lt;/tt&gt;
     * (defaults to &lt;tt&gt;'[checkbox id]-checkbox'&lt;/tt&gt;).
     */
<span id='Ext-form-FieldSet-cfg-collapsible'>    /**
</span>     * @cfg {Boolean} collapsible
     * &lt;tt&gt;true&lt;/tt&gt; to make the fieldset collapsible and have the expand/collapse toggle button automatically
     * rendered into the legend element, &lt;tt&gt;false&lt;/tt&gt; to keep the fieldset statically sized with no collapse
     * button (defaults to &lt;tt&gt;false&lt;/tt&gt;). Another option is to configure &lt;tt&gt;{@link #checkboxToggle}&lt;/tt&gt;.
     */
<span id='Ext-form-FieldSet-cfg-labelWidth'>    /**
</span>     * @cfg {Number} labelWidth The width of labels. This property cascades to child containers.
     */
<span id='Ext-form-FieldSet-cfg-itemCls'>    /**
</span>     * @cfg {String} itemCls A css class to apply to the &lt;tt&gt;x-form-item&lt;/tt&gt; of fields (see
     * {@link Ext.layout.FormLayout}.{@link Ext.layout.FormLayout#fieldTpl fieldTpl} for details).
     * This property cascades to child containers.
     */
<span id='Ext-form-FieldSet-cfg-baseCls'>    /**
</span>     * @cfg {String} baseCls The base CSS class applied to the fieldset (defaults to &lt;tt&gt;'x-fieldset'&lt;/tt&gt;).
     */
    baseCls : 'x-fieldset',
<span id='Ext-form-FieldSet-cfg-layout'>    /**
</span>     * @cfg {String} layout The {@link Ext.Container#layout} to use inside the fieldset (defaults to &lt;tt&gt;'form'&lt;/tt&gt;).
     */
    layout : 'form',
<span id='Ext-form-FieldSet-cfg-animCollapse'>    /**
</span>     * @cfg {Boolean} animCollapse
     * &lt;tt&gt;true&lt;/tt&gt; to animate the transition when the panel is collapsed, &lt;tt&gt;false&lt;/tt&gt; to skip the
     * animation (defaults to &lt;tt&gt;false&lt;/tt&gt;).
     */
    animCollapse : false,

<span id='Ext-form-FieldSet-method-onRender'>    // private
</span>    onRender : function(ct, position){
        if(!this.el){
            this.el = document.createElement('fieldset');
            this.el.id = this.id;
            if (this.title || this.header || this.checkboxToggle) {
                this.el.appendChild(document.createElement('legend')).className = this.baseCls + '-header';
            }
        }

        Ext.form.FieldSet.superclass.onRender.call(this, ct, position);

        if(this.checkboxToggle){
            var o = typeof this.checkboxToggle == 'object' ?
                    this.checkboxToggle :
                    {tag: 'input', type: 'checkbox', name: this.checkboxName || this.id+'-checkbox'};
            this.checkbox = this.header.insertFirst(o);
            this.checkbox.dom.checked = !this.collapsed;
            this.mon(this.checkbox, 'click', this.onCheckClick, this);
        }
    },

<span id='Ext-form-FieldSet-method-onCollapse'>    // private
</span>    onCollapse : function(doAnim, animArg){
        if(this.checkbox){
            this.checkbox.dom.checked = false;
        }
        Ext.form.FieldSet.superclass.onCollapse.call(this, doAnim, animArg);

    },

<span id='Ext-form-FieldSet-method-onExpand'>    // private
</span>    onExpand : function(doAnim, animArg){
        if(this.checkbox){
            this.checkbox.dom.checked = true;
        }
        Ext.form.FieldSet.superclass.onExpand.call(this, doAnim, animArg);
    },

<span id='Ext-form-FieldSet-method-onCheckClick'>    /**
</span>     * This function is called by the fieldset's checkbox when it is toggled (only applies when
     * checkboxToggle = true).  This method should never be called externally, but can be
     * overridden to provide custom behavior when the checkbox is toggled if needed.
     */
    onCheckClick : function(){
        this[this.checkbox.dom.checked ? 'expand' : 'collapse']();
    }

<span id='Ext-form-FieldSet-cfg-activeItem'>    /**
</span>     * @cfg {String/Number} activeItem
     * @hide
     */
<span id='Ext-form-FieldSet-cfg-applyTo'>    /**
</span>     * @cfg {Mixed} applyTo
     * @hide
     */
<span id='Ext-form-FieldSet-cfg-bodyBorder'>    /**
</span>     * @cfg {Boolean} bodyBorder
     * @hide
     */
<span id='Ext-form-FieldSet-cfg-border'>    /**
</span>     * @cfg {Boolean} border
     * @hide
     */
<span id='Ext-form-FieldSet-cfg-bufferResize'>    /**
</span>     * @cfg {Boolean/Number} bufferResize
     * @hide