This shows the browser button for a subclass on Pharo 9 on Linux (not the very latest Version 9 by the way). It only appears when you have the class definition tab selected.
I hope this shows up - I posted it earlier but it just hasn't appeared in the list - so I'm posting it again. With my luck it will probably appear twice now. <http://forum.world.st/file/t368903/subclassbutton.png> -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html