XmCreateMessageBox — The MessageBox widget creation function

     #include <Xm/MessageB.h>
Widget XmCreateMessageBox(
Widget parent,
String name,
ArgList arglist,
Cardinal argcount);

     XmCreateMessageBox creates an unmanaged MessageBox.  A
MessageBox is used for common interaction tasks, which
include giving information, asking questions, and reporting
errors.  It includes an optional symbol, a message, and
three buttons.

     By default, there is no symbol. The default button
labels are OK, Cancel, and Help.

     If the parent of the MessageBox is a DialogShell, use
XtManageChild to pop up the MessageBox (passing the
MessageBox as the widget parameter); use XtUnmanageChild to
pop it down.

parent    Specifies the parent widget ID

name      Specifies the name of the created widget

arglist   Specifies the argument list

argcount  Specifies the number of attribute/value pairs in
          the argument list (arglist)

     For a complete definition of MessageBox and its
associated resources, see XmMessageBox(3).

     Returns the MessageBox widget ID.