rem: gnome_property_box_changed,
add: activer_bouton_appliquer,
context: GtkWidget *onglet_echeances ( void ){  GtkWidget *box_pref1, *hbox_pref;  GtkWidget *separateur;  GtkWidget *label;  GtkWidget *hvbox;  hbox_pref = gtk_hbox_new ( FALSE,			     5 );  gtk_widget_show ( hbox_pref );  box_pref1 = gtk_vbox_new ( FALSE,			    5 );  gtk_box_pack_start ( GTK_BOX ( hbox_pref ),		       box_pref1,		       FALSE,		       FALSE,		       0);  gtk_widget_show ( box_pref1 );/*   configuration du nb de jours avant la prise d'une chance  */  label = gtk_label_new ( SPACIFY(COLON(_("Number of days before a warning message advertising a scheduled transaction"))) );  gtk_box_pack_start ( GTK_BOX ( box_pref1 ),		       label,		       FALSE,		       FALSE,		       0 );  gtk_widget_show ( label );  hvbox = gtk_hbox_new ( FALSE,			      10 );  gtk_box_pack_start ( GTK_BOX ( box_pref1 ),		       hvbox,		       FALSE,		       FALSE,		       0 );  gtk_widget_show ( hvbox );  entree_jours = gtk_entry_new_with_max_length (10);  gtk_widget_set_usize ( GTK_WIDGET ( entree_jours ),			 60,			 FALSE );  gtk_entry_set_text ( GTK_ENTRY ( entree_jours ),		       g_strdup_printf ( "%d",					 decalage_echeance ));  gtk_signal_connect_object ( GTK_OBJECT ( entree_jours ),			      "changed",			      gnome_property_box_changed,			      GTK_OBJECT (fenetre_preferences));  gtk_box_pack_end ( GTK_BOX ( hvbox ),		       entree_jours,		       FALSE,		       FALSE,		       0 );  gtk_widget_show ( entree_jours );  separateur = gtk_hseparator_new ();  gtk_box_pack_start ( GTK_BOX ( box_pref1 ),		       separateur,		       FALSE,		       FALSE,		       0 );  gtk_widget_show ( separateur );  return ( hbox_pref );}