private ID getId(CustomTreeItemDecorator item, HelpModel helpModel) {
			ID itemId = item.getID();
			if (itemId != null) {
				return itemId;
			}

			String tocID = item.getTocID();
			if (Objects.equals(tocID, ROOT_TOC_ID)) {
				HelpSet hs = helpModel.getHelpSet();
				return hs.getHomeID();
			}

			return null;
		}
Our hook to install our custom cell renderer.
Ghidra/Framework/Help/src/main/java/help/CustomTOCView.java