rem: gtk_toggle_button_set_active ( GTK_TOGGLE_BUTTON ( affichage_exercice ), exercice -> affiche_dans_formulaire );
add: checkbox_set_value ( affichage_exercice, &(exercice->affiche_dans_formulaire), TRUE );
context: void selection_ligne_exercice ( GtkWidget *liste,			      gint ligne,			      gint colonne,			      GdkEventButton *ev,			      GtkWidget *frame ){  struct struct_exercice *exercice;  ligne_selection_exercice = ligne;  exercice = gtk_clist_get_row_data ( GTK_CLIST ( liste ),				    ligne );/* remplit tous les champs */  gtk_entry_set_text ( GTK_ENTRY ( nom_exercice ),		       exercice -> nom_exercice );  if ( exercice -> date_debut )    gtk_entry_set_text ( GTK_ENTRY ( debut_exercice ),			 g_strdup_printf ( "%d/%d/%d",					   g_date_day ( exercice -> date_debut ),					   g_date_month ( exercice -> date_debut ),					   g_date_year ( exercice -> date_debut )));  if ( exercice -> date_fin )    gtk_entry_set_text ( GTK_ENTRY ( fin_exercice ),			 g_strdup_printf ( "%d/%d/%d",					   g_date_day ( exercice -> date_fin ),					   g_date_month ( exercice -> date_fin ),					   g_date_year ( exercice -> date_fin )));					     gtk_toggle_button_set_active ( GTK_TOGGLE_BUTTON ( affichage_exercice ),				 exercice -> affiche_dans_formulaire );  gtk_widget_set_sensitive ( frame,			     TRUE );  gtk_widget_set_sensitive ( hbox_boutons_modif_exercice,			     FALSE );  gtk_widget_set_sensitive ( bouton_supprimer_exercice,			     TRUE );}