/// <summary>
 /// Remove one or more topics using a topic selector expression.
 /// </summary>
 /// <param name="topicSelector">The selector expression.</param>
 /// <param name="callback">Notifies the result of the operation.</param>
 public void RemoveTopics(string topicSelector, ITopicControlRemoveCallback callback)
 {
     topicControl.RemoveTopics(topicSelector, callback);
 }
 /// <summary>
 /// Remove a single topic given its path.
 /// </summary>
 /// <param name="topicPath">The topic path.</param>
 /// <param name="callback">Notifies the result of the operation.</param>
 public void RemoveTopic(string topicPath, ITopicControlRemoveCallback callback)
 {
     topicControl.RemoveTopics(">" + topicPath, callback);
 }