calling a function on "destroy" signal

[John C Atkeson <jcatkeson juno com>]

  I'm trying to catch the event when a particular widget is destroyed, so
I can free some user_data along with it.
  But, even though I've tried a lot of different combinations, the
free_luggage function is never called.  
  
  The code is below, is there something obvious that I'm missing?
  
  Thanks in advance,  
  John
  
  
/* derived from scribble.c */

#include <gtk/gtk.h>
#include <stdlib.h>
#include <stdio.h>

GtkWidget *window;

typedef unsigned char byte;

typedef struct MyLuggageType{
  char MyString[256];
  long MyData;
}MyLuggageT;

gint free_luggage(GtkWidget *dummy, MyLuggageT *MyLuggage)
/**************************************************************
* *Supposed* to be called when this widget is destroyed.
**************************************************************/
{
  long cnt;
  free(MyLuggage);
  g_print("Luggage freed!\n");
  getchar(); /* wait for user to acknowledge */
  return (FALSE);
}

GtkWidget *my_window_create(gdouble wdt,gdouble hgt)
/**************************************************************
**************************************************************/
{
  GtkWidget *drawing_area = gtk_drawing_area_new ();
  MyLuggageT *MyLuggage=malloc(sizeof(MyLuggageT)); 

  MyLuggage->MyData=20;

  gtk_object_set_user_data (GTK_OBJECT(drawing_area), MyLuggage);
  gtk_drawing_area_size (GTK_DRAWING_AREA (drawing_area), wdt, hgt);
  gtk_widget_show (drawing_area);
  
  /* this doesn't work */
  gtk_signal_connect (GTK_OBJECT (drawing_area), "destroy_event",
                      GTK_SIGNAL_FUNC (free_luggage), MyLuggage);

  /* nor this either */
  gtk_signal_connect (GTK_OBJECT (drawing_area), "destroy",
                      GTK_SIGNAL_FUNC (free_luggage), MyLuggage);

  return (drawing_area);
}/* my_window_create */

void quit ()
/**************************************************************
**************************************************************/
{
  gtk_exit (0);
}

int main (int argc, char *argv[])
/**************************************************************
**************************************************************/
{
  GtkWidget *drawing_area;

  gtk_init (&argc, &argv);

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_widget_set_name (window, "Test Input");

  gtk_signal_connect (GTK_OBJECT (window), "destroy",
                      GTK_SIGNAL_FUNC (quit), NULL);

  /* Create the drawing area */
  drawing_area = my_window_create(200, 200);

  gtk_container_add (GTK_CONTAINER (window), drawing_area);

  gtk_widget_set_events (drawing_area, GDK_EXPOSURE_MASK
                         | GDK_LEAVE_NOTIFY_MASK
                         | GDK_DESTROY
                         | GDK_DELETE);

  gtk_widget_show (window);

  gtk_main ();

  return 0;
}
/* example-end */


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