+ /**
+ * Makes a list of row item owners of all the row items that are
+ * decendants of this item.
+ */
+ std::set< RowItemOwner* > list_row_item_owners();
+
+ /**
+ * Creates a list of decendant signals filtered by type.
+ */
+ template<class T>
+ std::set< std::shared_ptr<T> > list_by_type();
+