XmListSetAddMode allows applications
control over Add Mode in the extended selection model.
This function ensures that the mode it sets is compatible with the
selection policy (XmNselectionPolicy) of the widget. For
example, it cannot put the widget into add mode when the value of
XmNselectionPolicy is XmBROWSE_SELECT.
widget
Specifies the ID of the List widget
state
Specifies whether to activate or deactivate Add Mode.
If state
is True, Add Mode is activated. If state is
False, Add Mode is deactivated.
For a complete definition of List and its associated resources, see
XmList(3).