private void OnAddNewButtonClick(object sender, RoutedEventArgs e)
        {
            Window addNewArticleWindow = new AddNewItem();
            addNewArticleWindow.Show();
            //this.Visibility = Visibility.Collapsed;

        }
        private void OnAddNewButtonClick(object sender, RoutedEventArgs e)
        {
            Window addNewArticleWindow = new AddNewItem();

            addNewArticleWindow.Show();
            //this.Visibility = Visibility.Collapsed;
        }