动态改变filelable的值2

Ext.onReady( function () {
    new  Ext.form.FormPanel({
        renderTo : Ext.getBody(),
        items : [new  Ext.form.TimeField({
            id : 'time' ,
            fieldLabel : 'Time' ,
            name : 'time' ,
            minValue : '8:00am' ,
            maxValue : '6:00pm' ,
            listeners : {
                'select'  :  function (combo, record, index) {
                    var  msg =  "" ;
                    var  a = combo.el.parent().parent().parent().first();
                    for ( var  dd  in  a){
                        msg += dd + " " ;
                    }
                    a.dom.innerHTML = combo.getValue() + ":" ;
                }

            }
        })]
    });
})