/// <summary>
        /// Продать средний бизнес
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void SellMedium_Click(object sender, EventArgs e)
        {
            if (_mediumBusiness != null)
            {
                _mediumBusiness = null;

                Button_Text(buyMedium, "Купить");
                Button_Enable(sellMedium, false);
            }
        }
        /// <summary>
        /// Купить средний бизнес
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void buyMedium_Click(object sender, EventArgs e)
        {
            if (_mediumBusiness == null)
            {
                _mediumBusiness = new MediumBusiness();

                Button_Text(buyMedium, "Параметры");
                Button_Enable(sellMedium, true);
            }
            else
            {
                var demandProfessionsForm = new Demand_Business("medium");
                demandProfessionsForm.ShowDialog();
            }
        }