Hello. It is clear how to create tree hierarchies, based on zope folders structure, but I could not find examples of displaying as tree structures, which are external to zope. For example let us have a relational table LIST_NODES with the following columns: (ID_SELF:INTEGER , ID_PARENT:INTEGER , NAME_SELF:VARCHAR) it is very simple to write SQL methods for retrieving set of children of current node, so -- Best regards Oleg Machulski ---------------------------------------------------- http://www.geocities.com/SiliconValley/Network/7671/ mailto:oleg_machulski@geocities.com