XmCreateMessageBox — The MessageBox widget creation function "XmCreateMessageBox" "creation functions"

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).

XmCreateMessageBox  —  The  MessageBox widget creation function "XmCreateMessageBox" "creation functions"
       "XmCreateMessageBox"

XmMessageBox(3).

                                                                                           XmCreateMessageBox(3)

       Returns the MessageBox widget ID.

       #include <Xm/MessageB.h>
       WidgetXmCreateMessageBox(
       Widgetparent,
       Stringname,
       ArgListarglist,
       Cardinalargcount);