+ void SelectItemRange( wxGenericTreeItem *item1, wxGenericTreeItem *item2 );
+ bool TagAllChildrenUntilLast(wxGenericTreeItem *crt_item, wxGenericTreeItem *last_item, bool select);
+ bool TagNextChildren(wxGenericTreeItem *crt_item, wxGenericTreeItem *last_item, bool select);
+ void UnselectAllChildren( wxGenericTreeItem *item );
+