public SearchItemContainer(ComboSearch search, ISearchItem item)
 {
     Item    = item;
     _search = search;
     search.SearchTextChanged += OnSearchTextChanged;
 }
        private static void RaiseSearchTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            ComboSearch search = d as ComboSearch;

            search?.OnSearchTextChanged();
        }