Tile package reference: radiobutton

## NAME

ttk::radiobutton -
Mutually exclusive option widget

## SYNOPSIS

    ttk::radiobutton pathName ?options?

## DESCRIPTION

radiobutton widgets are used in groups to show or change a set of mutually-exclusive options. Radiobuttons are linked to a Tcl variable, and have an associated value; when a radiobutton is clicked, it sets the variable to its associated value.

## STANDARD OPTIONS

## OPTIONS

Name | Database name | Database class
--- | --- | ---
-command | command | Command
| A Tcl script to evaluate whenever the widget is invoked.
-value | Value | Value
| The value to store in the associated -variable when the widget is selected.
-variable | variable | Variable
| The name of a global variable whose value is linked to the widget. Default value is ::selectedButton.

## WIDGET COMMAND

In addition to the standard cget, configure, instate, and state commands, radiobuttons support the following additional widget commands:

pathname invoke
  Sets the -variable to the -value, selects the widget, and evaluates the associated -command. Returns the result of the -command, or the empty string if no -command is specified.

## WIDGET STATES

The widget does not respond to user input if the disabled state is set. The widget sets the selected state whenever the linked -variable is set to the widget's -value, and clears it otherwise. The widget sets the alternate state whenever the linked -variable is unset. (The alternate state may be used to indicate a ``tri-state'' or ``indeterminate'' selection.)

## SEE ALSO

widget(n), keynav(n), checkbutton(n)

## KEYWORDS

widget, button, option