When you need to add elements to a popupset, for example a tooltip, you can find useful to overlay the extensionPopupSet element defined by Komodo.
It isn’t mandatory, you can add elements where you want (maybe) but I consider a good practice using element dedicated to extension authors.
The code shown below is taken from MoreKomodo 1.4
<popupset id=“extensionPopupSet”>
<tooltip id=“morekomodo-refresh-tooltip” orient=“vertical”>
<hbox>
<description value=“&morekomodo.refresh.pattern;” />
<label id=“morekomodo-refresh-tooltip-pattern” value=“” />
</hbox>
</tooltip>
</popupset>