/*
         * Creates or updates the extra.
         */
        private void btnSave_Click(object sender, RoutedEventArgs e)
        {
            if (this.breakfast != null)
            {
                mFacade.UpdateBreakfast(this.breakfast,
                                        txtDietRequirements.Text);
            }
            else
            {
                mFacade.AddBreakFast(txtDietRequirements.Text);
            }

            this.Close();
        }