@Override
	public void treeNodesInserted(TreeModelEvent e) {

		Object[] path = e.getPath();
		Object[] me = e.getChildren();

		// build the tree path for the node being inserted
		Object[] childPath = new Object[path.length + 1];
		System.arraycopy(path, 0, childPath, 0, path.length);
		childPath[childPath.length - 1] = me[0];

		ProgramNode node = (ProgramNode) me[0];

		node.setTreePath(new TreePath(childPath));

		// set up GroupPath
		tree.setGroupPath(node);
	}
Method called when nodes are being inserted into the tree; update the treePath and the 
group path fields in the ProgramNode object.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/programtree/ProgramTreeModelListener.java