XmListItemExists - A List function that checks if a specified item is in the list
#include <Xm/List.h>
Boolean XmListItemExists (widget, item)
Widget widget;
XmString item;
XmListItemExists is a Boolean function that checks if a specified item is present in the list.
For a complete definition of List and its associated resources, see XmList(3X).
Returns True if the specified item is present in the list.