private void users_view_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            if (users_viewlist.SelectedItem == null)
            {
                return;
            }

            UserModify window = new UserModify((User)users_viewlist.SelectedItem);

            window.Owner = this;
            window.Show();
            Hide();
        }
        private void modify_user_Click(object sender, RoutedEventArgs e)
        {
            if (users_viewlist.SelectedItem == null)
            {
                return;
            }

            UserModify window = new UserModify((User)users_viewlist.SelectedItem);

            window.Owner = this;
            window.Show();
            Hide();
        }