EXTJS 3.0 资料 控件之 html 潜入label用法

这是在Extjs 中插入html 控件label！
 html: "<div><label id='howMany'>您共选中了</label><br/></div>"
获取label值：document.getElementById('howMany').innerText
赋值label值：document.getElementById('howMany').innerText = "这是赋值";
            document.getElementById('howMany').innerHTML

var westPanelForm = new Ext.form.FormPanel({
    id: 'westPanelForm',
     200,
    region: 'west',
    border: false,
    height: 340,
    frame: true,
    layout: 'form',
    items: [
    {
        layout: 'column',
        items: [{
            layout: 'form',  260, items: [{
                baseCls: 'x-plain',
                border: false,
                height:30,
                html: "<div><label id='howMany'>您共选中了</label><br/></div>"
            }]
        }]
    }, {
        layout: 'column',
        items: [gridPanelMd]
    }
    ]
});