The choice-item Widget
Syntax:
item ::= (choice-item [keyword argument]... value)A widget to represent a choice in a menu-choice widget. Its super is the item widget.
The value, if present, is used to initialize the :value property.
It overrides the following properties:
:action
Activating the button of a choice-item is equivalent to activating the parent widget.
:format
By default, it buttonizes the tag (i.e., its value) and adds a newline character at the end of the widget.