extjs GridPanel添加到TabPanel，列标题总是不显示，急~~~

[yuebao_whhit]

源码如下：
Ext.onReady(function(){
var tabs=new Ext.TabPanel
({
renderTo:"Container",
width:800,
autoHeight:true,
deferredRender:false,
region:'center',
height:200
});
var cm = new Ext.grid.ColumnModel
([
{header:'Name', dataIndex: 'filename',sortable:true},
{header:'No', dataIndex: 'lineNo',sortable:true},
{header:'Date', dataIndex: 'importDate',sortable:true}
]);

var importRecord = Ext.data.Record.create([
{name: 'filename', type: 'string'},
{name: 'lineNo', type: 'string'},
{name: 'importDate', type: 'string'}
]);
var data1 =[['A','B','C']];
var store1 = new Ext.data.Store
({
proxy: new Ext.data.MemoryProxy(data1),
reader: new Ext.data.ArrayReader({},importRecord)
});

store1.load();
var grid1 = new Ext.grid.GridPanel
({
store:store1,
cm:cm,
loadMask:true,
viewConfig:{forceFit:true},
autoHeight:true
});
tabs.add({
id:"grid1",
title:'ImportTool',
layout:'fit',
items:grid1,
autoHeight:true
});

tabs.activate(0);
});

gridPanel里的数据（A,B,C）能显示出来，但是grid.ColumnModel定义的header（Name,No,Date）显示不出来。
急求高手解答，多谢！！！！！！

[浴火_凤凰]

框架经常出问题，所以少用为妙！！！

[woshifou]

我在var cm = new Ext.grid.ColumnModel
([
{header:'Name', dataIndex: 'filename',sortable:true},
{header:'No', dataIndex: 'lineNo',sortable:true},
{header:'Date', dataIndex: 'importDate',sortable:true}
]); 这里面一般会加个id。

[xiuyouxu]

tabs.activate(0);
后面加
tabs.ownerCt.doLayout();
试试