public static class AsyncTestExtensions
{
    public static void EnqueueUntilLoaded(this SilverlightTest test, FrameworkElement element, params Action[] actions)
    {
        var isLoaded = false;
        element.Loaded += (s, e) => isLoaded = true;
        test.EnqueueConditional(() => isLoaded);
        test.EnqueueCallback(actions);
        test.EnqueueTestComplete();
    }
}