/// <summary>
 /// Raises the ParticleUpdate Event
 /// </summary>
 /// <param name="e">A ParticleUpdateEventArgs object containing 
 /// the data sent from the simulator</param>
 protected virtual void OnParticleUpdate(ParticleUpdateEventArgs e)
 {
     EventHandler<ParticleUpdateEventArgs> handler = m_ParticleUpdate;
     if (handler != null)
         handler(this, e);
 }