RadioButton
RadioButtons are round buttons that represent mutually exclusive
options. They always exist in groups. Exactly one RadioButton is
selected in each group.
When a RadioButton is selected, it has a dark center; when it is
not selected, the center is blank.
In the following example, the text can be either plain, bold, or
italic (plain is selected):
When the user clicks a RadioButton, it becomes selected and the
previously selected RadioButton in the group becomes
deselected.
Use RadioButtons to represent the state of an option. Do not use
them to invoke actions.
When a window opens, one RadioButton in a group must be
selected. You specify which is the initially selected RadioButton by
selecting the Checked property in the General property page in the
RadioButton’s Properties view.
Grouping RadioButtons
By default, all RadioButtons in a window are in one group, no
matter what their location in the window. Only one RadioButton can be
selected at a time.
You use a GroupBox control to group related RadioButtons. All
RadioButtons inside a GroupBox are considered to be in one group. One
button can be selected in each group.
The Automatic property
When a window contains several RadioButtons that are outside of
a GroupBox, the window acts as a GroupBox. Only one RadioButton can be
active at a time unless the check box for the Automatic property on
the RadioButton’s General property page is cleared.
When the Automatic property is not set, you must use scripts to
control when a button is selected. Multiple RadioButtons can be
selected outside of a group.
The Automatic property does not change how RadioButtons are
processed inside a GroupBox.