*/
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();
+
/**
* Computes the vertical extents of the contents of this row item owner.
* @return A pair containing the minimum and maximum y-values.