/// <summary>
        /// Handles the Click event of the NormalButton control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="RoutedEventArgs"/> instance containing the event data.</param>
        private void NormalButton_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                optionsViewModel.OptionModel.Difficulty = 2;
                optionsViewModel.SaveToXml();

                GamePlayWindow childWindow = new GamePlayWindow();
                this.Close();
                childWindow.ShowDialog();
            }
            catch (Exception error)
            {
                errorLogViewModel.LogError(error);
            }
        }
        /// <summary>
        /// Handles the Click event of the EasyButton control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="RoutedEventArgs"/> instance containing the event data.</param>
        private void EasyButton_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                // Set the difficulty.
                optionsViewModel.OptionModel.Difficulty = 1;
                optionsViewModel.SaveToXml();

                GamePlayWindow childWindow = new GamePlayWindow();
                this.Close();
                childWindow.ShowDialog();
            }
            catch (Exception error)
            {
                errorLogViewModel.LogError(error);
            }
        }