[Zope] search dtml-tree

Hi! I want to provide a search interface a dtml-tree. Users should query all of the nodes of the tree and if their keyword matches to the title of the node, the tree should automatically be expanded to display this node What is the best way to do it ? e.g.: A tree about cars: if the table is not expanded it looks like: +cars if it is searched with "Opel" it should expand to: -cars | |- Ferrari | |- Opel Thanks for your help, andreas