RadioButton

The RadioButton is a standard Motif widget. This object consists of a small 
diamond with a label string off to one side. If you click the first mouse button
anywhere inside the RadioButton (in the diamond or on the labelString), the 
diamond inverts its state: pushes in or pops out. When the diamond is pushed in,
the RadioButton is active. 

The RadioButton behaves very much like a ToggleButton except for one aspect:
only one RadioButton in a collection may be active at any one time. In fact,
one of the RadioButtons will always be active. When you activate an inactive
RadioButton, the previously active RadioButton becomes inactive. A ToggleButton,
on the other hand, can be set or unset independently of its neighbors.

See also: DebugDialog
