public static void Show(string errorMessage1, string errorMessage2, string errorMessage3)
        {
            FormShown = new PopupErrorBox(errorMessage1, errorMessage2, errorMessage3);

            FormShown.BringToFront();

            FormShown.ShowDialog();
        }
        static void DisposeItem()
        {
            if (FormShown != null)
            {
                FormShown.Close();
            }

            FormShown = null;
        }