jquery easyui关于datagrid新增一行 combobox 默认选中第一项问题

 1.jquery easyui关于datagrid新增一行 combobox 默认选中

$('#oilStorage').datagrid({
        //singleSelect: true,
        fitColumns: true,
        columns: [[
            { field: 'ck', checkbox: true ,width:30,align:'center'},
            {
                field: 'guanNum', title: '罐号', width: 100, align: 'center',             
                editor: {
                    type: 'combobox',                   
                    options: {
                        valueField: 'guanNum',
                        textField: 'oilTankName',
                        data: data1,
                        editable: true                

                    }
                }
            }]]

    $("#addOil").bind('click',function(){
	$('#oilStorage').datagrid('appendRow', {guanNum:data1[0].guanNum});
    });