[ScrollBar Command] probleme de capture

bonjour
j'aimerais reccup les commandes generées par le scrollbar
j'ai donc une fenêtre sur lakel je colle un scrollbar et je colle le code suivant dans ma fenetre

Code:

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            ExecutedRoutedEventHandler executedRoutedEventHandler = new ExecutedRoutedEventHandler(Window1.CommandHandler);
            CanExecuteRoutedEventHandler canExecuteRoutedEventHandler = new CanExecuteRoutedEventHandler(Window1.OnQueryScrollCommand);
 
            CommandManager.RegisterClassCommandBinding(typeof(Window1), new CommandBinding(ScrollBar.LineLeftCommand, executedRoutedEventHandler, canExecuteRoutedEventHandler));
            CommandManager.RegisterClassCommandBinding(typeof(Window1), new CommandBinding(ScrollBar.LineRightCommand, executedRoutedEventHandler, canExecuteRoutedEventHandler));
            CommandManager.RegisterClassCommandBinding(typeof(Window1), new CommandBinding(ScrollBar.PageLeftCommand, executedRoutedEventHandler, canExecuteRoutedEventHandler));
            CommandManager.RegisterClassCommandBinding(typeof(Window1), new CommandBinding(ScrollBar.PageRightCommand, executedRoutedEventHandler, canExecuteRoutedEventHandler));
            CommandManager.RegisterClassCommandBinding(typeof(Window1), new CommandBinding(ScrollBar.LineUpCommand, executedRoutedEventHandler, canExecuteRoutedEventHandler));
            CommandManager.RegisterClassCommandBinding(typeof(Window1), new CommandBinding(ScrollBar.LineDownCommand, executedRoutedEventHandler, canExecuteRoutedEventHandler));
            CommandManager.RegisterClassCommandBinding(typeof(Window1), new CommandBinding(ScrollBar.PageUpCommand, executedRoutedEventHandler, canExecuteRoutedEventHandler));
            CommandManager.RegisterClassCommandBinding(typeof(Window1), new CommandBinding(ScrollBar.PageDownCommand, executedRoutedEventHandler, canExecuteRoutedEventHandler));
            CommandManager.RegisterClassCommandBinding(typeof(Window1), new CommandBinding(ScrollBar.ScrollToLeftEndCommand, executedRoutedEventHandler, canExecuteRoutedEventHandler));
            CommandManager.RegisterClassCommandBinding(typeof(Window1), new CommandBinding(ScrollBar.ScrollToRightEndCommand, executedRoutedEventHandler, canExecuteRoutedEventHandler));
            CommandManager.RegisterClassCommandBinding(typeof(Window1), new CommandBinding(ScrollBar.ScrollToEndCommand, executedRoutedEventHandler, canExecuteRoutedEventHandler));
            CommandManager.RegisterClassCommandBinding(typeof(Window1), new CommandBinding(ScrollBar.ScrollToHomeCommand, executedRoutedEventHandler, canExecuteRoutedEventHandler));
            CommandManager.RegisterClassCommandBinding(typeof(Window1), new CommandBinding(ScrollBar.ScrollToTopCommand, executedRoutedEventHandler, canExecuteRoutedEventHandler));
            CommandManager.RegisterClassCommandBinding(typeof(Window1), new CommandBinding(ScrollBar.ScrollToBottomCommand, executedRoutedEventHandler, canExecuteRoutedEventHandler));
            CommandManager.RegisterClassCommandBinding(typeof(Window1), new CommandBinding(ScrollBar.ScrollToHorizontalOffsetCommand, executedRoutedEventHandler, canExecuteRoutedEventHandler));
            CommandManager.RegisterClassCommandBinding(typeof(Window1), new CommandBinding(ScrollBar.ScrollToVerticalOffsetCommand, executedRoutedEventHandler, canExecuteRoutedEventHandler));
            CommandManager.RegisterClassCommandBinding(typeof(Window1), new CommandBinding(ScrollBar.DeferScrollToHorizontalOffsetCommand, executedRoutedEventHandler, canExecuteRoutedEventHandler));
            CommandManager.RegisterClassCommandBinding(typeof(Window1), new CommandBinding(ScrollBar.DeferScrollToVerticalOffsetCommand, executedRoutedEventHandler, canExecuteRoutedEventHandler));

avec bien sur

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        private static void CommandHandler(object target, ExecutedRoutedEventArgs e)
        {
            MessageBox.Show("Command Handled!");
        }
        private static void OnQueryScrollCommand(object target, CanExecuteRoutedEventArgs args)
        {
            args.CanExecute = true;
        }

seulement je ne capture aucune commande si je rajoute
dans le xaml

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<Button Height="30" HorizontalAlignment="Left" Margin="74,0,0,10" 
                Command="ScrollBar.LineDownCommand"
                Name="button4" VerticalAlignment="Bottom" Width="111" >Button</Button>

j'ai bien l'event du scrollbar generé

a mon avis il doit y avoir kelkun qui bloque la remonté ....

pour info existe t-il un utilitaire pour espionner toutes les commandes ?