Tooltips, Context Menus and Popups
From Documentation
The support of tooltips, context menus and popups are generic. Any component inherited from XulElement can handle them in the same way.
Tooltips
To provide a custom tooltip, you could specify the ID of the custom tooltip in the target component's tooltip (XulElement.setTooltip(String) or XulElement.setTooltip(Popup)).
Notice that if you'd like to have different text for the tooltip (rather than a fully customized look), you shall use HtmlBasedComponent.setTooltiptext(String) instead (which is easier to use).
Context Menus
Popups
Version History
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