public static void CreateInstance(VolumeEventController eventController)
 {
     if (mInstance == null)
     {
         mInstance = new VolumeDescriptorList(eventController);
     }
 }
 public static void CreateInstance( VolumeEventController eventController )
 {
     if ( mInstance == null )
         mInstance = new VolumeDescriptorList( eventController );
 }