private void Window_Closing_1(object sender, System.ComponentModel.CancelEventArgs e)
        {
            var userPrefs = new UserPreferences();

            userPrefs.WindowHeight = this.Height;
            userPrefs.WindowWidth  = this.Width;
            userPrefs.WindowTop    = this.Top;
            userPrefs.WindowLeft   = this.Left;
            userPrefs.WindowState  = this.WindowState;

            userPrefs.Save();
        }