Tcl/Tk in a Nutshell

Name

lower

lower window [belowThis]

Change the window’s position in the stacking order. If belowThis is specified, it must be a sibling of window or a descendant of a sibling of window. In this case, window is placed in the stacking order just below belowThis (or its ancestor that is a sibling of window). If belowThis is not given, window is placed below all its siblings in the stacking order.