private void addDataXrefFieldsToListing() {
		runSwing(() -> {
			cb.getListingPanel().showHeader(true);

			FieldHeader header = cb.getListingPanel().getFieldHeader();
			int index = header.indexOfTab("Open Data");
			header.setSelectedIndex(index);
			FieldFormatModel model = header.getHeaderTab().getModel();
			addField(model, "XRef Header", 6);
			addField(model, "XRef", 7);

			cb.getListingPanel().showHeader(false);
		});
	}
Adds the XRef and XRef Header fields from the Open Data category to the
listing. These are not visible by default.
Ghidra/Features/Base/src/test.slow/java/ghidra/app/util/viewer/field/XrefViewerTest.java