public void CollectViewModel_TwoWay_AttachedProperty()
 {
     var textBox = new TextBox();
     var reference = DoCollectViewModel_TwoWay_AttachedProperty(textBox);
     TestUtils.GarbageCollect();
     Assert.That(reference.IsAlive, Is.True);
     textBox.ClearDataContext();
     TestUtils.GarbageCollect();
     Assert.That(reference.IsAlive, Is.False);
 }