Is there a way to force showing the Helptag? (With or without declares).
BTW for macOS
As an alternative I could use Tooltip. http://documentation.xojo.com/index.php/Tooltip
Still, it would be nice to know of the Helptag can be force too.
Maybe this helps.
https://forum.xojo.com/31084-listbox-cellhelptag-not-shown-in-64bit-apps/p2#p254398