XmToggleButtonGadgetSetState sets or changes the ToggleButtonGadget's
current state.
widget
Specifies the ToggleButtonGadget widget ID.
state
Specifies a Boolean value that indicates whether the ToggleButtonGadget state is
selected or unselected. If the value is True, the button state is selected;
if it is False, the button state is unselected.
notify
Indicates whether XmNvalueChangedCallback is called;
it can be either True or False.
The XmNvalueChangedCallback is only called when this function
changes the state of the ToggleButtonGadget.
When this argument is True and the ToggleButtonGadget is a child of a
RowColumn widget whose XmNradioBehavior is True, setting the
ToggleButtonGadget causes other ToggleButton and ToggleButtonGadget
children of the RowColumn to be unselected.
For a complete definition of ToggleButtonGadget and
its associated resources, see XmToggleButtonGadget(3).