XmDataFieldSetAddMode — A DataField function that sets the
state of Add mode

     #include <Xm/DataF.h>
void XmDataFieldSetAddMode(
Widget widget,
Boolean state);

     XmDataFieldSetAddMode controls whether or not the
DataField widget is in Add mode. When the widget is in Add
mode, the insert cursor can be moved without disturbing the
primary selection.

widget    Specifies the DataField widget ID

state     Specifies whether or not the widget is in Add
          mode. A value of True turns on Add mode; a value
          of False turns off Add mode.

     For a complete definition of DataField and its
associated resources, see XmDataField(3).