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a new treetable-like component has been added to netbeans code base. it has some advantages over the existing and buggy treetableview: multicolumn sorting, drag and drop support, in-place editing of tree cells etc. so please consider replacing TreeTableView with the new OutlineView in your code. the TreeTableView will be deprecated at the end netbeans 6.5 Milestone 2 and there is still some room for extensions and enhancements to OutlineView API depending on your requirements.
Profiler doesn't use TreeTableView.