private async Task CreateGroup()
        {
            var result = await((MainWindow)_window).ShowGroupCreateDialog();

            if (result == null)
            {
                return;
            }

            try
            {
                var newGroup = _cache.CreateGroup(result.Name, result.IsDeafult, result.Description);
                SelectedGroup = newGroup;
            }
            catch (WebException e)
            {
                ShowPopupWebException(e);
            }
        }