Grid is one of several Geometry Managers. Some others are pack and place. Those interested in grid may also want to have a look at GRIDPLUS2.
Grid is excellent for many kinds of common GUI forms because it arranges widgets in nice rows and columns, and handles resizing quite nicely.
If the first argument to grid is suitable as the first slave argument to grid configure, either a window name (i.e., a value starting with “.”) or one of the characters “x” or “^” (see the "RELATIVE PLACEMENT " section in the manual page), then the command is processed in the same way as grid configure.
A simple example is a panel with just a few labels and entries.
package require Tk
foreach field {Name Address City State Phone} {
# Create a couple of widgets
set l [label .lab$field -text $field]
set e [entry .ent$field -justify right ]
# Assign both to a row in the grid
grid $l $e -padx 4 -pady 4
# Then adjust how they appear
grid $l -sticky e
grid $e -sticky ew
}
# X-resize is done by the entry column
grid columnconfigure . 1 -weight 1
# Y-resize should be at the bottom...
set lastrow [lindex [grid size .] 1]
grid rowconfigure . [expr $lastrow - 1] -weight 1(add some detail here about why and how [pack] and [grid] might be used together
Tcl/Tk 8.5 vs iwidget 4.0.2 , comp.lang.tcl ,2008-08-18 , describes how a change between Tk 8.4 and 8.5 causes code which depends on the grid default behavior may need to be modified. The specific example is the iwidgets disjointlistbox, but other code may find the same issue.