Thank you very much. Now it is working. I've tried the View options previously without success; I must have done some mistakes. I want to create lessons and quizzes for my students, offline and online. The best would be Mobius, but it's too expensive, more expensive even than Maple TA; I cannot afford it for my individual needs. Thank you again for your support.

Thank you all. I've used a little bit GeoGebra in the past and now, as suggested, I am investigating it in more details. There is a big community of users and lots of resources, but still I feel a little bit more attracted by Geometry Expressions. The major advantage of GeoGebra is that is free. 

Thank you for your comments. I don't try to do anything special. I am a high school  Maths teacher working as a private tutor and try to start creating online lessons for my students. I was looking around for an easy to do drawing program to be able to create any geometry and trigonometry I need. I find Geometry Expressions easier to use than Maple, plus it has symbolic geometry capabilities which, if needed, can be imported in Maple for a further purpose. It creates also geometry apps which I find them having potential for my teaching. Thanks again for taking the time to comment on my question.

Thank you very much. I have sent a new support request. I will let you know as soon as all these issues will be sorted out.

Thank you for your support. I will find Samir Khan's post and learn from it.

Thank you very much. Knowing the code behind and the components will help me to learn quicker and easier. 

Thank you. I will try the new forum, but Maple TA or Mobius are too expensive for at this stage. 

Thank you. I have found the MapleTA[Import] command which can be used to import Maple TA course modules into Maple and run them in Maple using, let's say, the Grading[Quiz] command. I have tried to follow the instructions from the help page, but I don't fully understand them. Could be possible to have a full example to see how is it working? Thank you for support.