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
OutlineView as currently implemented is unusable for SuiteCustomizerLibraries; see JG02 in issue #33281.