private void NAICSList_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {


            if(NAICSList.SelectedIndex != -1)
            {
            ListBoxItem item = this.NAICSList.ItemContainerGenerator.ContainerFromIndex(NAICSList.SelectedIndex) as ListBoxItem;
            CheckBox tagregCheckBox = FindFirstElementInVisualTree<CheckBox>(item);

                if (tagregCheckBox.IsChecked != true)
                {
                    tagregCheckBox.IsChecked = true;
                }
                else
                {
                    tagregCheckBox.IsChecked = false;
                }
            }
            NAICSList.SelectedIndex = -1;

        }