easyui datagrid格式化列后行号无法对齐问题

$(function(){
$('#grid_trade_order_index').datagrid({
toolbar: "#tool_trade_order_index",
onLoadError: function(data){
showErrorMsg(data);
},
onLoadSuccess:function(data){    
   $("a[name='getDetail']").linkbutton({text:'查看详情',plain:true,iconCls:'icon-search'});
   //$("a[name='receipt']").linkbutton({text:'确认收货',plain:true,iconCls:'icon-ok'});
   $('#grid_trade_order_index').datagrid('fixRowHeight'); //格式化后行号对齐
}
});

});