DragonFly On-Line Manual Pages
lower(n) Tk Built-In Commands lower(n)
lower - Change a window's position in the stacking order
lower window ?belowThis?
If the belowThis argument is omitted then the command lowers window so
that it is below all of its siblings in the stacking order (it will be
obscured by any siblings that overlap it and will not obscure any
siblings). If belowThis is specified then it must be the path name of
a window that is either a sibling of window or the descendant of a
sibling of window. In this case the lower command will insert window
into the stacking order just below belowThis (or the ancestor of
belowThis that is a sibling of window); this could end up either
raising or lowering window.
All toplevel windows may be restacked with respect to each other,
whatever their relative path names, but the window manager is not
obligated to strictly honor requests to restack.
lower, obscure, stacking order
Tk 3.3 lower(n)