/// <summary>
        /// Метод нажатия кнопки "OK"
        /// </summary>
        private void OkFired()
        {
            if (Model != null)
            {
                Result = Model.SelectedItem.Clone<CategoryEx>();
                DialogResult = true;
                this.DialogResult = true;
            }
        }

        /// <summary>
        /// Событие при нажатии кнопки "OK"
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void OKButton_Click(object sender, RoutedEventArgs e)
        {
            OkFired();
        }