I also have this problem.
And it took my some hours to find the solution (with the help of the hint in this thread):
"The menubar in a JFace App Window is composed of MenuManagers and JFace Actions."
Aha! But this is far away from being intuitive to find out for a beginner !!!
i tried every drag&drop combination with the widgtes under Menu Controls.
Without success of course.
What makes learning SWT Designer difficult too, is the fact that all your screenshots
and videos look completely different from layout and menus/buttons than the current version of SWT Designer.
For example my SWT Designer Palette has 2 Columns and no Menu Bar Widget anywhere.
So your example at http://download.instantiations.com/D2WB ... iting.html
is not reproducable from the first step. Ihis is a very frustating at the beginning with a new tool.
There are many things which are not explainable and where the user wants to punch in the monitor...
For example now I have a new phenomenon where my ApplicationWindow at once got a very big size, and
the method getInitialSize() is by magic in the source. But changing the values in the method has no effect and
the window in the design-view can not be resized.... ahhhhrrrg!
This are those things which gives my developer-peers acknowledgement to decline a visual editor and makes
it hard for me to defend it. Hard for me to believe in the efficiency of such a tool too.