public void OpenEditor(User user)
        {
            try
            {
                if (user != null)
                {
                    user = user.Clone();
                }

                var editor = new UserEditorWindow(user);
                var result = editor.ShowDialog();

                if (result.HasValue && result.Value)
                {
                    RetrieveData();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }