@Override
		protected void setCellRenderer(NavigatorView view, JTree tree) {
			Map map = view.getHelpSet().getCombinedMap();
			tree.setCellRenderer(new CustomCellRenderer(map, (TOCView) view));
			ToolTipManager.sharedInstance().registerComponent(tree);
		}
Our hook to install our custom cell renderer.
Ghidra/Framework/Help/src/main/java/help/CustomTOCView.java