Control-c

Hello, 
I don't know how can I block the key control-c to be interpreted as a
cancel in FGLGUI=0, when I run a program in graphic mode it's perfect,
but when I use text mode, the control-c = cancel.
 
Here is an example:
example.4gl
DEFINE    cdepto  SMALLINT
MAIN  
  OPEN FORM ventana FROM "example"
  DISPLAY FORM ventana
  INPUT BY NAME cdepto 
    ON ACTION cancel
      MESSAGE "canceled!!"
      EXIT INPUT
      SLEEP 2
    ON KEY ( CONTROL-C )
      MESSAGE "Control-C!!"
      SLEEP 2
  END INPUT
  CLOSE FORM ventana
END MAIN
 
example.per
SCREEN 
{   
   Depto: [d1]
}END
  
ATTRIBUTES
   d1 = FORMONLY.cdepto TYPE SMALLINT, COLOR=CYAN;
END
 
 
Thank's for your help and time
 
Gabriel Arimany
Grupo Unipharm