extjs 写的树形菜单在ie6下无法显示？？？

Question

    extjs 写的树形菜单在ie6下无法显示？？？在Firefox下显示正常，这是为什么呢？

Answer 1

看看是否 treepanel的height 没写

Answer 2

Ext.onReady(function(){
 
       var tabPanel = new Ext.TabPanel( {
region : 'center',
enableTabScroll : true,
deferredRender : false,
activeTab : 0,
});

var addPanel = function(btn, event) {
var n;
n = tabPanel.getComponent(btn.id);
if(n) {
tabPanel.setActiveTab(n);
return;
}
n = tabPanel.add( {
id : btn.id,
title : btn.text,
width:10 ,
html : '<iframe width=100% height=100% src=' + btn.id + ' />',
//autoLoad : '',
closable : 'true'
});
tabPanel.setActiveTab(n);
}
     
        Ext.state.Manager.setProvider(new Ext.state.CookieProvider());
        new Ext.Viewport({
            layout:'border',
            items:[{
region: 'north',
html: '<table width="100%"><tr><td align="center"><embed src="topcut.jpg" width="100%" height="80"></td></tr><tr background="newmenubg.gif" class="text_write"><td><div align="center"> <a href="http://localhost:8080/7_yjssx_system/PracticingFirstPage.jsp" class="a_write STYLE30">首 页 </a></div></td></tr><table>',
height: 105,
minHeight: 100
                },{
                    region:'west',
                    id:'west-panel',
                    title:'菜单导航',
                    split:true,
                    width: 200,
                    minSize: 175,
                    maxSize: 400,
                    border:0,
                    collapsible: true,
                    layout:'accordion',
                    layoutConfig:{
                        animate:true
                    },
                    items: [{
                        title:'公文管理',
                        border:false,
                        iconCls:'document',
                        xtype: 'treepanel',
                        loader: new Ext.tree.TreeLoader(),
        root: new Ext.tree.AsyncTreeNode({
            expanded: true,
            children: [{
                text: '管理员',
                icon:'edit_profile.gif',
                children: [{
                 id :'http://localhost:8080/7yjssx_systom1.0/yjssxAdmin/AdminSystemFunctionDeploy!preTutorSelectDeploy.action',
            text: '发文拟稿',
            leaf: true,
                 icon:'gif-0498.gif',
                 listeners : {
click : addPanel
}
         },{
            id :'test/test2.jsp',
            text: '代办发文',
            leaf: true,
                 icon:'gif-0498.gif',
                 listeners : {
click : addPanel
}
         },{
            id :'test/test3.jsp',
            text: '发文查询',
            leaf: true,
                 icon:'gif-0498.gif',
                 listeners : {
click : addPanel
}
         },{
            id :'test/test4.jsp',
            text: '流程维护',
            leaf: true,
                 icon:'gif-0498.gif',
                 listeners : {
click : addPanel
}
         },{
            id :'test/test5.jsp',
            text: '流程监控',
            leaf: true,
                 icon:'gif-0498.gif',
                 listeners : {
click : addPanel
}
         }]
            }，
               tabPanel
             ]
        });
        
    });