// Switch the ITreeRowModel implementation between using native grid
// Hide/Show or GlazedList TreeList Hide/Show
// TreeLayer treeLayer = new TreeLayer(rowHideShowLayer, new
// TreeRowModel<Datum>(treeData), true);
TreeLayer treeLayer = new TreeLayer(rowHideShowLayer,
new GlazedListTreeRowModel<Datum>(treeData), false);
SelectionLayer selectionLayer = new SelectionLayer(treeLayer);
ViewportLayer viewportLayer = new ViewportLayer(selectionLayer);