autoExpandParent设置无效

[xjindf]

当我子节点选中设置isopen为true时，希望自动展开父节点，但设置无效，下面是数据格式：
var data = [
{
"label": "安徽省",
"id": "001",
"children": [
{
"label": "淮北市",
"id": "001001"
},
{
"label": "马鞍山市",
"id": "001002",
"children": [
{
"label": "花山区",
"id": "001002001",
"isOpen": true
},
{
"label": "雨山区",
"id": "001002002"
}
]
}
]
}
]