Hi again Rainer.
This is either a bug somewhere or you do something that remove the buttons.
What you have "acheived" here is something that a lot of users have requested ;-) I.e. to be able to remove the close button from forms so the developer can control the order of closing etc.
Above you can see how it looks out of the box. We tested both Menu document and Form document.
As you can see it has all the accoutrements it should have.
Your example is also missing the document icon as well as the resizing buttons next to the close button.
This looks like you have used our SetCurrent() function to manipulate your window look.
This looks like
Anyhow, you should get back the correct look by executing.