public static void RegisterTopicRenderer(string typeName, ITopicRenderer renderer)
 {
     typeName = TopicTypeHelper.GetNormalizeName(typeName);
     if (RegisteredRenderers.ContainsKey(typeName))
     {
         RegisteredRenderers[typeName] = renderer;
     }
     else
     {
         RegisteredRenderers.Add(typeName, renderer);
     }
 }
 public static ITopicRenderer GetRegisteredTopicRenderer(string typeName)
 {
     typeName = TopicTypeHelper.GetNormalizeName(typeName);
     return(RegisteredRenderers.ContainsKey(typeName) ? RegisteredRenderers[typeName] : null);
 }