+ // force appearance of [+] button near the item. This is useful to
+ // allow the user to expand the items which don't have any children now
+ // - but instead add them only when needed, thus minimizing memory
+ // usage and loading time.
+ void SetItemHasChildren(const wxTreeItemId& item, bool has = TRUE);
+
+ // the item will be shown in bold
+ void SetItemBold(const wxTreeItemId& item, bool bold = TRUE);
+