<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body text="#000000" bgcolor="#FFFFFF"> Hi Alexandre, When you need new behaviors from the class or/and you need more than once the GUI design, you will likely subclass. In whole DrGeo code, I only subclass LayoutMoprh once, for a DrGeoMiniView. As suggested Ken, if you are in building GUI, take a look at the Cuis-Smalltalk-UI repo, there are several examples. You will see subclasses of LayoutMorph as the Check and Radio group but not that much. LayoutMorph are more often used as instances then added in the Morph. See for example the Panel class. Hilaire <div class="moz-cite-prefix">Le 14/03/2023 à 00:29, Alexandre Rousseau a écrit : </div> <blockquote type="cite" cite="mid:CAKmOay+kF=s7ZbiaeQ+pgAb0XnMb3BL0aq+3aWOdLXp6-zbyAA@mail.gmail.com">What distinguishes a complex widget from their counterparts? In my case, here is a screenshot of work in progress... a sampling of widgets placed on a PasteUpMorph instance. Each of </blockquote> <pre class="moz-signature" cols="72">-- GNU Dr. Geo <a class="moz-txt-link-freetext" href="http://drgeo.eu">http://drgeo.eu</a> <a class="moz-txt-link-freetext" href="http://blog.drgeo.eu">http://blog.drgeo.eu</a></pre> </body> </html>