Tree2 rebuild node expansion

[Daniel Haensse]

Dear list,

I implemented some simple code that rebuilds my tree if necessary 
(serverside). Now I would like to expand all nodes, that were previously 
expanded before the rebuild. Any idea how this could be done? 

Function that rebuilds the tree:

        private void rebuildTreeData() {        
           // Invalidate and rebuild tree
           this.treeModel=null;    
           this.htmlTree = new HtmlTree();
           this.selectedNode=null;
           // getTreeData rebuilds the tree from scratch
           getTreeData();          
        }

Any hints are appreciated.

best regards

Dani