raise

raise - Change a window's position in the stacking order

button .b -text "Hi there!"
pack [frame .f -background blue]
pack [label .f.l1 -text "This is above"]
pack .b -in .f
pack [label .f.l2 -text "This is below"]
raise .b

原文地址:https://www.cnblogs.com/greencolor/p/2136278.html