[Ada] program error: access violation après un Emit_By

Bonjour,

Voici mon code :

Code:

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   function Saver_Event
     (Object : access Gtk_Widget_Record'Class;
      User_Data : Ultra_Address_To_Access.Object_Pointer) return Boolean;      
 
   function saver_Event
     (Object : access Gtk_Widget_Record'Class;
     User_Data : Ultra_Address_To_Access.Object_Pointer) return Boolean
   is
 
      Dialog : Gtk.Dialog.Gtk_Dialog;
      Yes    : Gtk.Widget.Gtk_Widget;
      No     : Gtk.Widget.Gtk_Widget;            
   begin
 
      loop
         Gtk.Dialog.Gtk_New(Dialog, "Save ?", User_Data.Mainwin, Gtk.dialog.modal);
         Yes := Gtk.Dialog.Add_Button(Dialog, "Yes", Gtk.Dialog.Gtk_Response_Yes);
         No := Gtk.Dialog.Add_Button(Dialog, "No", Gtk.Dialog.Gtk_Response_No);         
         case Gtk.Dialog.Run(Dialog) is
            when Gtk.Dialog.Gtk_Response_Yes    =>               
	       Destroy(Object);
               Gtk.Dialog.Destroy(Dialog);	       
	       Gtk.Main.Main_Quit;               
               return True;
            when Gtk.Dialog.Gtk_Response_No     =>
	       Destroy(Object);
               Gtk.Dialog.Destroy(Dialog);       
	       Gtk.Main.Main_Quit;
               return True;
            when others =>
               Gtk.Dialog.Destroy(Dialog);
         end case;
      end loop;      
 
   end saver_Event;
 
 
   procedure saver(Ultrason : in Ultrason_Access) is
      Verax : Boolean := False;
   begin
      Gtk.Main.Init;
      Gtk_New
	(Ultrason.Mainwin);
      Set_Title
	(Ultrason.Mainwin, 
	 "Ultrason 2015 MIDI Composer : " & Ultrason.Theory.File.all);      
      Gtk.Window.Set_Position
	(Ultrason.Mainwin, 
	 Win_Pos_Center);
      Gtk.Window.Set_Default_Size
	(Ultrason.Mainwin, 
	 800, 600);
 
      -- Window Exit connect. --
      Window_Cb.Connect (Ultrason.Mainwin, "destroy",
			 Window_Cb.To_Marshaller (Exit_Main'Access),
			 Ultrason);
 
      -- Window Delete connect. --
      Return_Window_Cb.Connect (Ultrason.Mainwin, "delete_event",
				Return_Window_Cb.To_Marshaller (saver_Event'access),
				Ultrason,
				After => True);
 
      -- Create Mainbox. --
      Gtk.Box.Gtk_New_Vbox (Ultrason.Mainbox, False, 0);            
      Gtk.Window.Add(Ultrason.Mainwin, Ultrason.Mainbox);
 
      Gtk.Window.Show_All
	(Ultrason.Mainwin);
 
      Verax := Return_Window_Cb.Emit_By_Name(Ultrason.Mainwin, "delete_event");
 
      Gtk.Main.Main;
   end Saver;

Sans l'appel à emit_by_name, ça marche impec, mais donc une exception program error est levé aux click sur les bouton yes/no de du dialog saver_event si j'utilise emit_by_name.

Pourquoi ?

S"il vous plait,
Merci.

[Ada] program error: access violation après un Emit_By_Name.