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+'\"
+'\" Copyright (c) 1990-1994 The Regents of the University of California.
+'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
+'\"
+'\" See the file "license.terms" for information on usage and redistribution
+'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+'\" 
+.\" The -*- nroff -*- definitions below are for supplemental macros used
+.\" in Tcl/Tk manual entries.
+.\"
+.\" .AP type name in/out ?indent?
+.\"	Start paragraph describing an argument to a library procedure.
+.\"	type is type of argument (int, etc.), in/out is either "in", "out",
+.\"	or "in/out" to describe whether procedure reads or modifies arg,
+.\"	and indent is equivalent to second arg of .IP (shouldn't ever be
+.\"	needed;  use .AS below instead)
+.\"
+.\" .AS ?type? ?name?
+.\"	Give maximum sizes of arguments for setting tab stops.  Type and
+.\"	name are examples of largest possible arguments that will be passed
+.\"	to .AP later.  If args are omitted, default tab stops are used.
+.\"
+.\" .BS
+.\"	Start box enclosure.  From here until next .BE, everything will be
+.\"	enclosed in one large box.
+.\"
+.\" .BE
+.\"	End of box enclosure.
+.\"
+.\" .CS
+.\"	Begin code excerpt.
+.\"
+.\" .CE
+.\"	End code excerpt.
+.\"
+.\" .VS ?version? ?br?
+.\"	Begin vertical sidebar, for use in marking newly-changed parts
+.\"	of man pages.  The first argument is ignored and used for recording
+.\"	the version when the .VS was added, so that the sidebars can be
+.\"	found and removed when they reach a certain age.  If another argument
+.\"	is present, then a line break is forced before starting the sidebar.
+.\"
+.\" .VE
+.\"	End of vertical sidebar.
+.\"
+.\" .DS
+.\"	Begin an indented unfilled display.
+.\"
+.\" .DE
+.\"	End of indented unfilled display.
+.\"
+.\" .SO ?manpage?
+.\"	Start of list of standard options for a Tk widget. The manpage
+.\"	argument defines where to look up the standard options; if
+.\"	omitted, defaults to "options". The options follow on successive
+.\"	lines, in three columns separated by tabs.
+.\"
+.\" .SE
+.\"	End of list of standard options for a Tk widget.
+.\"
+.\" .OP cmdName dbName dbClass
+.\"	Start of description of a specific option.  cmdName gives the
+.\"	option's name as specified in the class command, dbName gives
+.\"	the option's name in the option database, and dbClass gives
+.\"	the option's class in the option database.
+.\"
+.\" .UL arg1 arg2
+.\"	Print arg1 underlined, then print arg2 normally.
+.\"
+.\" .QW arg1 ?arg2?
+.\"	Print arg1 in quotes, then arg2 normally (for trailing punctuation).
+.\"
+.\" .PQ arg1 ?arg2?
+.\"	Print an open parenthesis, arg1 in quotes, then arg2 normally
+.\"	(for trailing punctuation) and then a closing parenthesis.
+.\"
+.\"	# Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
+.if t .wh -1.3i ^B
+.nr ^l \n(.l
+.ad b
+.\"	# Start an argument description
+.de AP
+.ie !"\\$4"" .TP \\$4
+.el \{\
+.   ie !"\\$2"" .TP \\n()Cu
+.   el          .TP 15
+.\}
+.ta \\n()Au \\n()Bu
+.ie !"\\$3"" \{\
+\&\\$1 \\fI\\$2\\fP (\\$3)
+.\".b
+.\}
+.el \{\
+.br
+.ie !"\\$2"" \{\
+\&\\$1	\\fI\\$2\\fP
+.\}
+.el \{\
+\&\\fI\\$1\\fP
+.\}
+.\}
+..
+.\"	# define tabbing values for .AP
+.de AS
+.nr )A 10n
+.if !"\\$1"" .nr )A \\w'\\$1'u+3n
+.nr )B \\n()Au+15n
+.\"
+.if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n
+.nr )C \\n()Bu+\\w'(in/out)'u+2n
+..
+.AS Tcl_Interp Tcl_CreateInterp in/out
+.\"	# BS - start boxed text
+.\"	# ^y = starting y location
+.\"	# ^b = 1
+.de BS
+.br
+.mk ^y
+.nr ^b 1u
+.if n .nf
+.if n .ti 0
+.if n \l'\\n(.lu\(ul'
+.if n .fi
+..
+.\"	# BE - end boxed text (draw box now)
+.de BE
+.nf
+.ti 0
+.mk ^t
+.ie n \l'\\n(^lu\(ul'
+.el \{\
+.\"	Draw four-sided box normally, but don't draw top of
+.\"	box if the box started on an earlier page.
+.ie !\\n(^b-1 \{\
+\h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
+.\}
+.el \}\
+\h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
+.\}
+.\}
+.fi
+.br
+.nr ^b 0
+..
+.\"	# VS - start vertical sidebar
+.\"	# ^Y = starting y location
+.\"	# ^v = 1 (for troff;  for nroff this doesn't matter)
+.de VS
+.if !"\\$2"" .br
+.mk ^Y
+.ie n 'mc \s12\(br\s0
+.el .nr ^v 1u
+..
+.\"	# VE - end of vertical sidebar
+.de VE
+.ie n 'mc
+.el \{\
+.ev 2
+.nf
+.ti 0
+.mk ^t
+\h'|\\n(^lu+3n'\L'|\\n(^Yu-1v\(bv'\v'\\n(^tu+1v-\\n(^Yu'\h'-|\\n(^lu+3n'
+.sp -1
+.fi
+.ev
+.\}
+.nr ^v 0
+..
+.\"	# Special macro to handle page bottom:  finish off current
+.\"	# box/sidebar if in box/sidebar mode, then invoked standard
+.\"	# page bottom macro.
+.de ^B
+.ev 2
+'ti 0
+'nf
+.mk ^t
+.if \\n(^b \{\
+.\"	Draw three-sided box if this is the box's first page,
+.\"	draw two sides but no top otherwise.
+.ie !\\n(^b-1 \h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c
+.el \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c
+.\}
+.if \\n(^v \{\
+.nr ^x \\n(^tu+1v-\\n(^Yu
+\kx\h'-\\nxu'\h'|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'|0u'\c
+.\}
+.bp
+'fi
+.ev
+.if \\n(^b \{\
+.mk ^y
+.nr ^b 2
+.\}
+.if \\n(^v \{\
+.mk ^Y
+.\}
+..
+.\"	# DS - begin display
+.de DS
+.RS
+.nf
+.sp
+..
+.\"	# DE - end display
+.de DE
+.fi
+.RE
+.sp
+..
+.\"	# SO - start of list of standard options
+.de SO
+'ie '\\$1'' .ds So \\fBoptions\\fR
+'el .ds So \\fB\\$1\\fR
+.SH "STANDARD OPTIONS"
+.LP
+.nf
+.ta 5.5c 11c
+.ft B
+..
+.\"	# SE - end of list of standard options
+.de SE
+.fi
+.ft R
+.LP
+See the \\*(So manual entry for details on the standard options.
+..
+.\"	# OP - start of full description for a single option
+.de OP
+.LP
+.nf
+.ta 4c
+Command-Line Name:	\\fB\\$1\\fR
+Database Name:	\\fB\\$2\\fR
+Database Class:	\\fB\\$3\\fR
+.fi
+.IP
+..
+.\"	# CS - begin code excerpt
+.de CS
+.RS
+.nf
+.ta .25i .5i .75i 1i
+..
+.\"	# CE - end code excerpt
+.de CE
+.fi
+.RE
+..
+.\"	# UL - underline word
+.de UL
+\\$1\l'|0\(ul'\\$2
+..
+.\"	# QW - apply quotation marks to word
+.de QW
+.ie '\\*(lq'"' ``\\$1''\\$2
+.\"" fix emacs highlighting
+.el \\*(lq\\$1\\*(rq\\$2
+..
+.\"	# PQ - apply parens and quotation marks to word
+.de PQ
+.ie '\\*(lq'"' (``\\$1''\\$2)\\$3
+.\"" fix emacs highlighting
+.el (\\*(lq\\$1\\*(rq\\$2)\\$3
+..
+.\"	# QR - quoted range
+.de QR
+.ie '\\*(lq'"' ``\\$1''\\-``\\$2''\\$3
+.\"" fix emacs highlighting
+.el \\*(lq\\$1\\*(rq\\-\\*(lq\\$2\\*(rq\\$3
+..
+.\"	# MT - "empty" string
+.de MT
+.QW ""
+..
+.TH button n 4.4 Tk "Tk Built-In Commands"
+.BS
+'\" Note:  do not modify the .SH NAME line immediately below!
+.SH NAME
+button \- Create and manipulate button widgets
+.SH SYNOPSIS
+\fBbutton\fR \fIpathName \fR?\fIoptions\fR?
+.SO
+\-activebackground	\-font	\-relief
+\-activeforeground	\-foreground	\-repeatdelay
+\-anchor	\-highlightbackground	\-repeatinterval
+\-background	\-highlightcolor	\-takefocus
+\-bitmap	\-highlightthickness	\-text
+\-borderwidth	\-image	\-textvariable
+\-compound	\-justify	\-underline
+\-cursor	\-padx	\-wraplength
+\-disabledforeground	\-pady
+.SE
+.SH "WIDGET-SPECIFIC OPTIONS"
+.OP \-command command Command
+Specifies a Tcl command to associate with the button.  This command
+is typically invoked when mouse button 1 is released over the button
+window.
+.OP \-default default Default
+Specifies one of three states for the default ring: \fBnormal\fR,
+\fBactive\fR, or \fBdisabled\fR.  In active state, the button is drawn
+with the platform specific appearance for a default button.  In normal
+state, the button is drawn with the platform specific appearance for a
+non-default button, leaving enough space to draw the default button
+appearance.  The normal and active states will result in buttons of
+the same size.  In disabled state, the button is drawn with the
+non-default button appearance without leaving space for the default
+appearance.  The disabled state may result in a smaller button than
+the active state.
+.OP \-height height Height
+Specifies a desired height for the button.
+If an image or bitmap is being displayed in the button then the value is in
+screen units (i.e. any of the forms acceptable to \fBTk_GetPixels\fR);
+for text it is in lines of text.
+If this option is not specified, the button's desired height is computed
+from the size of the image or bitmap or text being displayed in it.
+.OP \-overrelief overRelief OverRelief
+Specifies an alternative relief for the button, to be used when the
+mouse cursor is over the widget.  This option can be used to make
+toolbar buttons, by configuring \fB\-relief flat \-overrelief
+raised\fR.  If the value of this option is the empty string, then no
+alternative relief is used when the mouse cursor is over the button.
+The empty string is the default value.
+.OP \-state state State
+Specifies one of three states for the button:  \fBnormal\fR, \fBactive\fR,
+or \fBdisabled\fR.  In normal state the button is displayed using the
+\fBforeground\fR and \fBbackground\fR options.  The active state is
+typically used when the pointer is over the button.  In active state
+the button is displayed using the \fBactiveForeground\fR and
+\fBactiveBackground\fR options.  Disabled state means that the button
+should be insensitive:  the default bindings will refuse to activate
+the widget and will ignore mouse button presses.
+In this state the \fBdisabledForeground\fR and
+\fBbackground\fR options determine how the button is displayed.
+.OP \-width width Width
+Specifies a desired width for the button.
+If an image or bitmap is being displayed in the button then the value is in
+screen units (i.e. any of the forms acceptable to \fBTk_GetPixels\fR).
+For a text button (no image or with \fB\-compound none\fR) then the width 
+specifies how much space in characters to allocate for the text label.
+If the width is negative then this specifies a minimum width.
+If this option is not specified, the button's desired width is computed
+from the size of the image or bitmap or text being displayed in it.
+.BE
+
+.SH DESCRIPTION
+.PP
+The \fBbutton\fR command creates a new window (given by the
+\fIpathName\fR argument) and makes it into a button widget.
+Additional
+options, described above, may be specified on the command line
+or in the option database
+to configure aspects of the button such as its colors, font,
+text, and initial relief.  The \fBbutton\fR command returns its
+\fIpathName\fR argument.  At the time this command is invoked,
+there must not exist a window named \fIpathName\fR, but
+\fIpathName\fR's parent must exist.
+.PP
+A button is a widget that displays a textual string, bitmap or image.
+If text is displayed, it must all be in a single font, but it
+can occupy multiple lines on the screen (if it contains newlines
+or if wrapping occurs because of the \fBwrapLength\fR option) and
+one of the characters may optionally be underlined using the
+\fBunderline\fR option.
+It can display itself in either of three different ways, according
+to
+the \fBstate\fR option; 
+it can be made to appear raised, sunken, or flat;
+and it can be made to flash.  When a user invokes the
+button (by pressing mouse button 1 with the cursor over the
+button), then the Tcl command specified in the \fB\-command\fR
+option is invoked.
+
+.SH "WIDGET COMMAND"
+.PP
+The \fBbutton\fR command creates a new Tcl command whose
+name is \fIpathName\fR.  This
+command may be used to invoke various
+operations on the widget.  It has the following general form:
+.CS
+\fIpathName option \fR?\fIarg arg ...\fR?
+.CE
+\fIOption\fR and the \fIarg\fRs
+determine the exact behavior of the command.  The following
+commands are possible for button widgets:
+.TP
+\fIpathName \fBcget\fR \fIoption\fR
+Returns the current value of the configuration option given
+by \fIoption\fR.
+\fIOption\fR may have any of the values accepted by the \fBbutton\fR
+command.
+.TP
+\fIpathName \fBconfigure\fR ?\fIoption\fR? ?\fIvalue option value ...\fR?
+Query or modify the configuration options of the widget.
+If no \fIoption\fR is specified, returns a list describing all of
+the available options for \fIpathName\fR (see \fBTk_ConfigureInfo\fR for
+information on the format of this list).  If \fIoption\fR is specified
+with no \fIvalue\fR, then the command returns a list describing the
+one named option (this list will be identical to the corresponding
+sublist of the value returned if no \fIoption\fR is specified).  If
+one or more \fIoption\-value\fR pairs are specified, then the command
+modifies the given widget option(s) to have the given value(s);  in
+this case the command returns an empty string.
+\fIOption\fR may have any of the values accepted by the \fBbutton\fR
+command.
+.TP
+\fIpathName \fBflash\fR
+Flash the button.  This is accomplished by redisplaying the button
+several times, alternating between active and normal colors.  At
+the end of the flash the button is left in the same normal/active
+state as when the command was invoked.
+This command is ignored if the button's state is \fBdisabled\fR.
+.TP
+\fIpathName \fBinvoke\fR
+Invoke the Tcl command associated with the button, if there is one.
+The return value is the return value from the Tcl command, or an
+empty string if there is no command associated with the button.
+This command is ignored if the button's state is \fBdisabled\fR.
+
+.SH "DEFAULT BINDINGS"
+.PP
+Tk automatically creates class bindings for buttons that give them
+default behavior:
+.IP [1]
+A button activates whenever the mouse passes over it and deactivates
+whenever the mouse leaves the button.
+Under Windows, this binding is only active when mouse button 1 has
+been pressed over the button.
+.IP [2]
+A button's relief is changed to sunken whenever mouse button 1 is
+pressed over the button, and the relief is restored to its original
+value when button 1 is later released.
+.IP [3]
+If mouse button 1 is pressed over a button and later released over
+the button, the button is invoked.  However, if the mouse is not
+over the button when button 1 is released, then no invocation occurs.
+.IP [4]
+When a button has the input focus, the space key causes the button
+to be invoked.
+.PP
+If the button's state is \fBdisabled\fR then none of the above
+actions occur:  the button is completely non-responsive.
+.PP
+The behavior of buttons can be changed by defining new bindings for
+individual widgets or by redefining the class bindings.
+
+.SH EXAMPLES
+This is the classic Tk
+.QW "Hello, World!"
+demonstration:
+.PP
+.CS
+    \fBbutton\fR .b \-text "Hello, World!" \-command exit
+    pack .b
+.CE
+.PP
+This example demonstrates how to handle button accelerators:
+.PP
+.CS
+    \fBbutton\fR .b1 \-text Hello \-underline 0
+    \fBbutton\fR .b2 \-text World \-underline 0
+    bind . <Key\-h> {.b1 flash; .b1 invoke}
+    bind . <Key\-w> {.b2 flash; .b2 invoke}
+    pack .b1 .b2
+.CE
+.SH "SEE ALSO"
+ttk::button(n)
+.SH KEYWORDS
+button, widget