public void AddNewTheme()
        {
            var themeId    = string.Empty;
            var themeIndex = _palette.Themes.Count;

            _editService.Edit($"Add {typeof(T).Name} Theme {themeIndex}",
                              () => themeId = _palette.AddTheme().Id,
                              () => _palette.RemoveTheme(themeId),
                              markAsIdOrNameDirty: true);
        }