关于ext多行下拉框的问题 lovcombo

{  

hideOnSelect:false

,xtype: 'lovcombo'

,maxHeight:150

,width:200 

,fieldLabel: '坐席组'

,emptyText: '请选择...' ,store: Ext.getCmp('seatPanel').seatsGroup

,valueField: 'seatsGroupId'//显示值的value

,displayField: 'seatsGroupName'//要显示的值

 ,hiddenName: 'seat.seatGroups'

,triggerAction:'all'

,mode:'local'

,editable : false

,beforeBlur: function(){}

,allowBlank: false

,value:ids

// ,defaultData: {seatsGroupId: '-1',seatsGroupName: '全选'}

}  ,

各位大大们,普通下拉框,用value就可以确定默认选中的项,现在多行下拉框传个ids给value ,其中ids=3,4,5这样的,怎么显示不能默认显示出三项啊?