new PropertyRenderableColumn(new ColumnLocation(Alignment.MIDDLE, 3,
Unit.PROPORTIONAL), "M3", "userObject.property5"),
new PropertyRenderableColumn(new ColumnLocation(Alignment.RIGHT, 8, Unit.EM), "R1",
"userObject.property6"), };
tree = new TreeTable("treeTable", createTreeModel(), columns);
tree.getTreeState().setAllowSelectMultiple(true);
add(tree);
tree.getTreeState().collapseAll();
}