Ext.form.ComboBox and loadRecord

ExtJs修改窗口combobox数据绑定及初始化
在Window 中侦听show
listeners:{
   "show":function()
       {
        EditUserInfoForm.getForm().loadRecord(row);
       }
     }    
窗体加载后ComboBox的值并不能被正确赋值，如下：

可能是ComboBox数据加载在后，loadRecord赋值在前，导致赋值失败，那么侦听下ComboBox数据的加载load事件看看可行，在它的load事件里加上 EditUserInfoForm.getForm().loadRecord(row); 呵呵，果然可以。是一个绑定顺序出了问题。ok.那么在ComboBox的数据加载的load事件里为其赋值typeCombo.setValue(1) 可以吗？测试了下，不行，原因不明。
http://extjs.com/forum/showthread.php?t=42699

items还不能有id属性，有的话，comboobx可能显示不出来，或combobox不能显示对应选择的display值。
1.combobox不能显示对应选择的display值

2.comboobx显示不出来


3.在cmb数据加载是窗体初始化，同时去掉combobox的id属性后即可


部分代码如下：

 var EditUserRoleFields = Ext.data.Record.create([      
        {name: 'roleid',mapping:'roleid'},{name: 'rolename',mapping:'rolename'},{name:'roledesc',mapping:'roledesc'}                     
    ]);    
    
   var  EditUserRoleStore = new Ext.data.Store({      
        proxy: new Ext.data.HttpProxy({      
            url:'DATA/RoleInfo/GetRoleInfo.aspx'  
        }),      
        reader: new Ext.data.JsonReader({      
            root: 'data',      
            id: 'roleid'     
        },
        EditUserRoleFields 
        )      
    });
    EditUserRoleStore.on('load',
                             function()
                             {                             
                                 EditUserInfoForm.getForm().loadRecord(row); 
                             } 
                          )  
    EditUserRoleStore.load();
    

 var EditUserInfoForm=new Ext.form.FormPanel({
            width:315,
            height:270,
            plain:true,
            layout:"form",
            defaultType:"textfield",
            labelWidth:45,
            baseCls:"x-plain",
            defaults:{anchor:"95%",msgTarget:"side"},
            buttonAlign:"center",
            bodyStyle:"padding:0 0 0 0",
            items:[   
            {
                    name:"userid",
                    fieldLabel:"帐号",
                    allowBlank:false,
                    blankText:"帐号不允许为空"
            },{
                    name:"userpwd",
                    fieldLabel:"密码",
                    allowBlank:false,
                    blankText:"密码不能为空",
                    inputType:"password"
            },{
                    name:"username",
                    fieldLabel:"称谓",
                    allowBlank:false,
                    blankText:"称呼不能为空",
                    regex:/^[\s\S]{1,10}$/,
                    regexText:"昵称请不要超过10个字符"
            },{     
                    
                    name:"userstate",
                    xtype:"combo",
                    fieldLabel:"状态",
                    editable: false,
                    typeAhead: true,
                    //传入后台真实值value field /value
                    hiddenName:"userstate",
                    mode:"local",
                    displayField:"show",
                    valueField:"value",
                    triggerAction:"all",
                    value:"0",
                    store:new Ext.data.SimpleStore({
                        fields:["show","value"],
                        data:[["正常","0"],["禁用","1"]]
                    })
            },{               
                    xtype:"combo",
                    tpl: '<tpl for="."><div ext:qtip="{rolename}. {roledesc}" class="x-combo-list-item">{rolename}</div></tpl>',
                    store: EditUserRoleStore,
                    typeAhead: true,
                    fieldLabel:'角色',
                    hiddenName:'roleid',
                    name:'roleid',
                   // id:'roleid',
                    forceSelection: true,
                    triggerAction: 'all',
                    emptyText:'选择角色类型',
                    selectOnFocus:true,
                    width:130,
                    editable: false, 
                    allowBlank:false, 
                    blankText:'请选择角色类型', 
                    displayField:'rolename',
                    valueField: 'roleid',
                    mode: 'remote'                   
            }            
            ]});