public void TestExtenderMethods ()
{
TableLayoutPanel p = new TableLayoutPanel ();
Control c = new Button ();
Assert.AreEqual (new TableLayoutPanelCellPosition (-1, -1), p.GetCellPosition (c), "A1");
Assert.AreEqual (-1, p.GetColumn (c), "A2");
Assert.AreEqual (1, p.GetColumnSpan (c), "A3");
Assert.AreEqual (-1, p.GetRow (c), "A4");
Assert.AreEqual (1, p.GetRowSpan (c), "A5");
p.SetCellPosition (c, new TableLayoutPanelCellPosition (1, 1));
Assert.AreEqual (new TableLayoutPanelCellPosition (1, 1), p.GetCellPosition (c), "A6");
p.SetColumn (c, 2);
Assert.AreEqual (2, p.GetColumn (c), "A7");
p.SetRow (c, 2);
Assert.AreEqual (2, p.GetRow (c), "A9");
p.SetColumnSpan (c, 2);
Assert.AreEqual (2, p.GetColumnSpan (c), "A8");
p.SetRowSpan (c, 2);
Assert.AreEqual (2, p.GetRowSpan (c), "A10");
Assert.AreEqual (new TableLayoutPanelCellPosition (2, 2), p.GetCellPosition (c), "A11");
// ???????
//Assert.AreEqual (new TableLayoutPanelCellPosition (-1, -1), p.GetPositionFromControl (c), "A12");
//Assert.AreEqual (c, p.GetControlFromPosition(0, 0), "A13");
}