Hi Estaban.Thank you for your helpful and prompt replies to my problem. Unfortunately,your code does not work for me.I pasted your code into a playground. When it runs I get no errors but I geta completely blank window - no sign of the colour gradient.If I change the backend to #Morphic, I get the gradient but, as you say, itdoes not resize.I just seem to be very unlucky with Gtk.Ken--Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html