protected void addCustomToolbarItems(final JHelp jHelp) {

		for (Component component : jHelp.getComponents()) {
			if (component instanceof JToolBar) {
				JToolBar toolbar = (JToolBar) component;
				toolbar.addSeparator();

				ImageIcon icon =
					new MultiIconBuilder(new EmptyIcon(24, 24)).addCenteredIcon(ZOOM_OUT_ICON)
							.build();

				Icon zoomOutIcon = icon;
				JButton zoomOutBtn = new JButton(zoomOutIcon);
				zoomOutBtn.setToolTipText("Zoom out");
				zoomOutBtn.addActionListener(e -> {
					GHelpHTMLEditorKit.zoomOut();

					// Need to reload the page to force the scroll panes to resize properly. A
					// simple revalidate/repaint won't do it.
					reloadHelpPage();
				});
				toolbar.add(zoomOutBtn);

				icon = new MultiIconBuilder(new EmptyIcon(24, 24)).addCenteredIcon(ZOOM_IN_ICON)
						.build();
				Icon zoomInIcon = icon;
				JButton zoomInBtn = new JButton(zoomInIcon);
				zoomInBtn.setToolTipText("Zoom in");
				zoomInBtn.addActionListener(e -> {
					GHelpHTMLEditorKit.zoomIn();

					// Need to reload the page to force the scroll panes to resize properly. A
					// simple revalidate/repaint won't do it.
					reloadHelpPage();
				});
				toolbar.add(zoomInBtn);

				// Once we've found the toolbar we can break out of the loop and stop looking for it.
				break;
			}
		}
	}
Create zoom in/out buttons on the default help window toolbar.
@param jHelp the java help object used to retrieve the help components
Ghidra/Framework/Help/src/main/java/help/GHelpBroker.java