private void interval_Click(object sender, RoutedEventArgs e)
        {
            g.Children.Clear();
            lister_paiements u = new lister_paiements();

            u.type.Content = "par intervalle de dates";
            g.Children.Add(u);
        }
        private void mensuel_Click(object sender, RoutedEventArgs e)
        {
            g.Children.Clear();
            lister_paiements u = new lister_paiements();

            u.type.Content = "mensuels";
            g.Children.Add(u);
        }