Hmmmm ye. I'm getting the impression that Qwt 6 has many handy new functions. I think I will need to have a word with the my promotor. I'm programming with this version because the software packet I need to work on, is a project for multiple years (for master students). I'm at the second workyear now and from the beginning, there was said to keep on using this function untill, let's say Qwt version 6.2 is out. They always wait for a couple of new versions untill they can be sure the new Qwt will be stable, nuff said. :-)