#include <Xm/List.h> void XmListSetAddMode( Widget widget, Boolean state);
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.
Specifies the ID of the List widget
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).