private void updateStateView(NQueensBoard board,Metrics metrics){
  Platform.runLater(null);
  simPaneCtrl.waitAfterStep();
}

private void updateStateView ( NQueensBoard board , Metrics metrics ) { Platform . runLater ( null ) ; simPaneCtrl . waitAfterStep ( ) ; }
caution : while the background thread should be slowed down , updates of the gui have to be done in the gui thread !
