private void CategoryTree_Expanded(object sender, RoutedEventArgs e)
{
TreeViewItem this_TreeViewItem = e.Source as TreeViewItem;
TypeDigest parentCategoryTypeDigest = (TypeDigest)this_TreeViewItem.Tag;
if (this_TreeViewItem.Items.Count > 0 && this_TreeViewItem.Items[0] is TreeViewItem && ((TreeViewItem)this_TreeViewItem.Items[0]).Tag is LoadingTreeViewItem)
{
this_TreeViewItem.Items.Clear();
foreach (TypeDigest childTypeDigest in _typeRepository.GetTypeDigestsByParent(parentCategoryTypeDigest.Id))
{
this_TreeViewItem.Items.Add(CreateCategoryTreeViewItem(childTypeDigest.Code, childTypeDigest));
}
}
}