Thank you for your information. Yes I'm aware of the fact that if you know Moodle more then average that you can find this in the system. But for most users in a commercial environment it's a new experience to work with Moodle and they really don't know these things of course . The trick was more difficult though because it makes a difference if the users is enrolled in two or three courses or more aparently. My users most of the time only enroll in one or two.
I found my answer on this link : https://moodle.org/mod/forum/discuss.php?d=328348