ext2의tree id는 유일한 해결 방법이 아니다

createNode : function(attr){
        if(this.baseAttrs){
            Ext.applyIf(attr, this.baseAttrs);
        }
        if(this.applyLoader !== false){
            attr.loader = this;
        }
		attr.text = attr.dirname;
		attr.id = attr.dirid;
		attr.treeid = attr.type+attr.dirid;// 
        if(typeof attr.uiProvider == 'string'){
           attr.uiProvider = this.uiProviders[attr.uiProvider] || eval(attr.uiProvider);
        }
        return(attr.leaf ?
            new Ext.tree.TreeNode(attr) :
            new Ext.tree.AsyncTreeNode(attr));
    }

Ext.override(Ext.tree.TreePanel,{
	getNodeByTreeId : function(treeid){
        return this.nodeHash[treeid];
    },
	registerNode : function(node){
        this.nodeHash[node.attributes.treeid] = node;
    },
	unregisterNode : function(node){
        delete this.nodeHash[node.attributes.treeid];
    }

})

Ext.override(Ext.tree.TreeNode,{
	ensureVisible : function(callback){
        var tree = this.getOwnerTree();
        tree.expandPath(this.parentNode.getPath(), false, function(){
            var node = tree.getNodeByTreeId(this.attributes.treeid);  // Somehow if we don't do this, we lose changes that happened to node in the meantime
            tree.getTreeEl().scrollChildIntoView(node.ui.anchor);
            Ext.callback(callback);
        }.createDelegate(this));
    }
})

Ext.override(Ext.tree.TreeEventModel,{
	getNode : function(e){
        var t;
        if(t = e.getTarget('.x-tree-node-el', 10)){
            var id = Ext.fly(t, '_treeEvents').getAttributeNS('ext', 'tree-node-id');
            if(id){
                return this.tree.getNodeByTreeId(id);
            }
        }
        return null;
    }
})

onNodeOver : function(n, dd, e, data){
		if(n.node == undefined){
			return;
		}

*****
}

var attr = {
					text: ' ',
					type: node.attributes.type,
					treeid: Ext.id(null, node.attributes.type),
					uiProvider: BufTreeSpecUI
				}
var n = new Ext.tree.TreeNode(attr);