[FRAME]

I tried it - it works.

But I think, it is better to add the following line :

wm transient .test [winfo toplevel [winfo parent .test]]

to :

...

toplevel .test
wm title .test "3D"

# here is it !
wm transient .test [winfo toplevel [winfo parent .test]]

frame .views.xyzframe -bd 2 -relief sunken
frame .views.xyzframe.f
pack .views.xyzframe.f -fill both -expand 1

...


The 3D window is always on top now.

Frank