void AutoCompleteTextBox_Loaded(object sender, System.Windows.RoutedEventArgs e)
 {
     _acm = new AutoCompleteManager();
     _acm.Asynchronous = true;
     _acm.DataProvider = AutoCompleteDataProvider;
     _acm.AttachTextBox(this);
 }
        public AutoCompleteComboBox()
        {
            this.IsEditable = true;
            this.IsTextSearchEnabled = false;
            this.GotMouseCapture += AutoCompleteComboBox_GotMouseCapture;

            _acm = new AutoCompleteManager();
        }