How to get JTree to load all its nodes after some nodes are removed in collaspe event?

public class LazyLoadedTree extends JTree {
 
   /* Creates new LazyLoadedTree based on a TreeModel */
   public LazyLoadedTree(TreeModel model) {
       super(model);
       addTreeExpansionListener(new CollapseHandler());
    }
 
    class CollapseHandler implements TreeExpansionListener {
        // Do nothing in treeExpand method
        public void treeExpanded(TreeExpansionEvent event) { }
 
        /** Remove children notes when a node is collapsed */
        public void treeCollapsed(TreeExpansionEvent event) {
            TreeNode node = (TreeNode) event.getPath().getLastPathComponent();
            int childIndices[] = new int[node.getChildCount()];
            Object[] removedChildren = new Object[node.getChildCount()];
            for(int x = 0; x < node.getChildCount(); x++) {
                childIndices[x] = x;
                removedChildren[x] = node.getChildAt(x);
            }
            // Remove the children notes and send them to gabage collection
            getModel().nodesWereRemoved(node, childIndices, removedChildren);
            // this method sets all children node to null
            SetChidrenToNull (node);
        }
    }// End of class CollapseHandler
}// End of class LazyLoadedTree

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