Yes, that might be only official place about Tk MDI. Actually, I tried the
example : "Internal Movable Windows". That reminds me of my Visual Baisc
experience long time ago. Since we do not have existing sub-windows
widgets, we may be able to draw them! I did that under Win3.1.
However, the major difficulty for me is how to attach a "move" event to a
widget, also a "resize" event, etc.
Forgive me for that, I am a newbie to Tk. I combine your examples of
Pull-Down Menus, Frames, plus a Label widget on toplevel(). Next I am
trying to figure out how to move frames within the Label. (Cannot do it
yet.)