public void treeExpanded(TreeExpansionEvent event) {
TreePath treePath = event.getPath();
if (treePath != null) {
TreeUINode targetNode = (TreeUINode) treePath.getLastPathComponent();
if (!targetNode.isChildrenLoaded()) {
String targetPathText = TreeUtil.makePathText(treePath);
String absPathText = PathUtil.makeChildPath(_tree.getRelativeRoot(), targetPathText);
expandNode(targetNode, absPathText);
}
}
}
