private void ColorThemeComboBox_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            switch (ColorThemeComboBox.SelectedIndex)
            {
            case 0:
                Properties.Settings.Default.SelectedColorTheme = ColorTheme.DeepSea();
                break;

            case 1:
                Properties.Settings.Default.SelectedColorTheme = ColorTheme.SummerBreeze();
                break;

            case 2:
                Properties.Settings.Default.SelectedColorTheme = ColorTheme.PurplePassion();
                break;
            }
        }