Dynamic Tree Cant change back end data dynamically

I am using the ajax component within the dynamic tree widget and cannot , after numerous tries, to get
the tree to function without having the completed modle at the backend.
I had hoped that I could create sub level leaf node structure within the callback for the node being selected.
This seemed to work at the top level but after that , no events are trapped for any sub children that I create dynamically within the tree model.


Within the callback.


                TreeNode2 thisNode= ne.getEventNode();
               
                logger.debug("ID is "+thisNode.getId());
               
                int eventType = ne.getEventType();
               
                if ( eventType == TreeNode2Event.LOADCHILDREN_EVENT) {
                        thisNode.setExpanded(true);
                       
                        logger.debug("Load children event occured");
                       
                        // lets find out if we have to show any children
                        // get the id of the node so that we can find out where we are.
                        // walk backwards up the tree
                       
                        thisNode.getChildren().clear(); // get rid of the empty node.
                       
                        // we need to find out the name of the folder we are looking at
                        String path = this.constructPath(thisNode);
                       
                        logger.debug("PATH we are looking at is "+path);
                       
                        this.constructChildren(thisNode, new File(path));

                        ....


Wtihin the constructChildren I am appending mode children to the node that has just been clicked.
( This is part of a file browser type application ).
However, each sub node click never invoked the callback.

I am setting the method expression correctly within the code and have checked this with a test application.
It would appear that the woodstock components have a snap shot of the structure.

Can any one help here ???