private WpfButton _searchButton;
        public WpfButton SearchButton
        {
            get
            {
                if (_searchButton == null)
                {
                    _searchButton = new WpfButton(this);
                    _searchButton.SearchProperties[WpfButton.PropertyNames.Name] = "Search";

                    if (_searchButton == null)
                        throw new NullReferenceException("SearchButton not found");

                }
                return _searchButton;
            }
        }