The TreeTable is an extended Table component that can show hierarchical structures in its first column. Users can show or hide children from a small icon before the actual column value in the first column. The TreeTable is designed to scale well with large number of rows similar to Table component in the core Vaadin. Only visible rows and some "cache rows" are loaded to the client side. With the Collapsible container extension developer can build the data accessing so that it does not consume too much memory on the server side either. --- TreeTable has been integrated into Vaadin 6.7 and this add-on will not receive any further updates. All changes will be made to the Vaadin Framework only. ---