I put a short note about this on the FAQ: http://geda.seul.org/dokuwiki/doku.php?id=geda:faq-gschem
Please let me know of any suggestions/corrections. BTW, Ales, this illustrates the point I made about relying on externally supported library objects (specifically GTK's GtkTreeView). You never know when one of those nice, shiny, up to date libraries will sprout a bug and bite you in a big way! Stuart
