ExtJS4combobox 设置默认选中值

var combostore = new Ext.data.ArrayStore({        fields: ['val', 'lbl'],        data: [['0', '已注册'], ['1', '已审核通过'], ['2', '已审核未通过'], ['3', '已无效']]    });==================================================={xtype:'label',text:'状态：'},{xtype:'combo',id:'state',width:130,store:combostore,displayField: 'lbl',valueField: 'val',editable: true,mode: 'local',triggerAction: 'all'},=============================================listeners:{     //双击事件itemdblclick:function(view,record,item,index,e,eOpts){    //alert(record.get('id'));//双击获取id //alert(index);    },         //渲染之后         afterrender : function(){         Ext.getCmp('state').reset();                 Ext.getCmp('state').setValue(combostore.getAt(1));                 }}