protected JComponent createTooltipComponent(String content) {

		if (!isValidTooltipContent(content)) {
			return null;
		}

		JToolTip tt = new JToolTip();
		tt.setTipText(content);
		return tt;
	}
Base class for listing hover extensions.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/hover/AbstractHover.java