<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body text="#000000" bgcolor="#FFFFFF"> This is what I tried to explained. It occurs with Smalltalk Script, for example (mySketch point: 0@0) color: (Color red adjustBrighness: 0.125) In the constructed sketch below, when the user decided to invoke the style dialog for point, this color is not one of the defined ones in the DrGeo drop down colors menu. In that circumstance, the index is zero and the GUI crash. In the picture below, I can set the selected color to none (the button is empty) because nil is returned instead of an index access error. For DrGeo to take of this situation, I need the GUI to return nil and not throw an error. <img src="cid:part1.l4pn31CN.xTjUY6nA@free.fr" alt=""> <div class="moz-cite-prefix">Le 26/01/2026 à 19:54, Juan Vuletich a écrit : </div> <blockquote type="cite" cite="mid:3ccc5e1b-6de4-4aff-9e40-493b14975f89@cuis.st"> I can not see how #getListItem: could be called with a 0 argument. Perhaps it is the sender in DrGeo that can take care of that? Thanks, </blockquote> <pre class="moz-signature" cols="72">-- <a class="moz-txt-link-freetext" href="http://mamot.fr/@drgeo">http://mamot.fr/@drgeo</a></pre> </body> </html>