If your Smart PropertyGrid question does not involve private stuff, if it's like "How do I do..." or "There's a problem", it might makes sense to put it on Stackoverflow with tags [PropertyGrid] and [VisualHint]. Use common sense and try to guess if other developers could benefit from the question and the answer. If I don't see your question there under 48h (I follow the propertygrid tag feed), send me a notification by email.

In all other cases, simply contact me by email.