Combo下拉树TreePanel问题

var tree = new Tree.TreePanel({

autoScroll:true,

autoHeight: true,

border: false,

animate:true,

enableDD:true,

rootVisible:true,

containerScroll: true,

loader: myTreeLoader,

root: {

nodeType: 'async',

text: '菜单',

id: '-1'
},
listeners:{
render:function(tree){
tree.el.on('click',function(e){
e.stopPropagation();
})
}
}
});
//以上代码可以阻止关闭combo，这样的话 需要手动关闭combo