Guzzi idea :
Adding this in GUIWindow.cs in Loadskin() allow easily to find calls for GUI not coming from main thread.
Could be in a "if debug" if we want to make sure it is not running in non debug mode ...


h4. Additional Information
// add thread check to log calls not running in main thread/GUI
      int iCurrentThread = Thread.CurrentThread.ManagedThreadId;
      if (iCurrentThread != 1)
      {
        Log.Error("LoadSkin: Running on thread <{0}> instead of main thread - StackTrace: '{1}'", iCurrentThread, Environment.StackTrace);
      }