public TreeTableImpl(TreeTableModel treeModel) {
super(treeModel);
rootRenderer = createRootRenderer();
pkRenderer = createPrimaryKeyRenderer();
indicatorRenderer = createIndicatorRenderer();
setOpenIcon(new TableIcon());
setClosedIcon(new TableIcon());
setLeafIcon(null);
addHighlighter(new DownloadIndicatorHighlighter());
setDragEnabled(true);
setTransferHandler(new TreeTransferHandler());
// In multi-selection mode the user must use two mouse gestures to start a