The following example creates two frames and packs them toward the top side of the main window. The upper frame, .one, is not as big and the main window shows through on either side. The children are packed toward the specified side in order, so .one is on top. The four possible sides are: top, right, bottom, and left. The top side is the default.
# Make the main window black . config -bg black # Create and pack two frames frame .one -width 40 -height 40 -bg white frame .two -width 100 -height 50 -bg grey50 pack .one .two -side top