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);
}