public void NavigationTest()
{
Assert.AreEqual (17, treeTable.Children.Count, "treeTable child count");
Accessible a1 = treeTable.Children [0];
Accessible a2 = treeTable.Children [1];
Assert.AreNotEqual (a1, a2, "Children [0] != Children [1]");
Assert.AreEqual (Role.TableColumnHeader, a1.Role, "Children [0].Role");
Assert.AreEqual (Role.TableCell, a2.Role, "Children [1].Role");
}