Hi, I havn't used TableMatrix enough to answer offhand. From my understanding of tags on the Tk::Canvas I would bet that you need to use the -browsecmd and -selcmd callbacks to do some juggling of the tags. It may require complicated callbacks, maybe with arrays of rows which need their tags changed. Look at tags as something fluid, change tags, change them back, etc. Sometimes it takes a bit of contemplation to get it right. :-)