public void NullLocalValue ()
{
Brush blue = new SolidColorBrush(Colors.Blue);
Brush red = new SolidColorBrush(Colors.Red);
Style style = new Style(typeof(Canvas));
style.Setters.Add(new Setter(Canvas.BackgroundProperty, red));
Canvas c = new Canvas();
c.Background = blue;
c.Style = style;
Assert.AreEqual(blue, c.Background, "#1");
c.Background = null;
Assert.AreEqual(null, c.Background, "#2");
c.ClearValue(Canvas.BackgroundProperty);
Assert.AreEqual(red, c.Background, "#3");
}
