How to achieve correct KeyValuePair serialization with JsonFX?

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There is a test code like this

IList list;
      list = new List<KeyValuePair<string, object>>();

      list.Add(new KeyValuePair<string, object>("A", 1));
      list.Add(new KeyValuePair<string, object>("B", new KeyValuePair<string, object>("TEST0", 12345)));
      list.Add(new KeyValuePair<string, object>("C", new KeyValuePair<string, object>("TEST1", new TEST0_CLASS() { prop = 15 })));

After serializing the list object via JsonFx.JsonWriter.Serialize I get [{},{},{}]. How to properly serialize objects of type KeyValuePair ? I didn't find it on google.