@Override
	public String getToolTipText(MouseEvent event) {
		String tip = generateToolTip(event);
		manager.showToolTipPopup(event, tip);
		return null; // signal not to show a Java tooltip
	}
Panel to display markers. Normally placed to the left hand side of the scrolled
{@link FieldPanel}.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/marker/MarkerPanel.java