void DataFileLoader_OnDataFileLoaded(DataFile dataFile, List<ObjectClass> objectClasses)
 {
     ObjectClassManager.ObjectClasses.AddRange(objectClasses);
     if (this.InvokeRequired)
     {
         this.Invoke(new UpdateProgressDelegate(UpdateProgress));
     }
     else
     {
         UpdateProgress();
     }
 }
 public static void AddDataFile(DataFile dataFile)
 {
     DataFiles.Add(dataFile);
 }