Did you know...
...that JFormDesigner visually indicates a button group,
when the mouse cursor is over a button group member.
It displays a line that connects the group members.
To create a button group, select the radio buttons you want to group and
select Group Buttons from the popup menu.
To remove a button from a group, select it and select Ungroup Buttons
from the popup menu.
You can extend existing button groups by selecting at least one
button of the existing group and the button that you want to add
to that button group, then select Group Buttons from the popup menu.