docs: @Override
  	public void openImageSet(String ...files ) {
  		synchronized (lockProcessing) {
  			if( processing ) {
  				JOptionPane.showMessageDialog(this, "Still processing");
  				return;
  			}
  		}
  		// disable the menu until it finish processing the images
  		setMenuBarEnabled(false);
  		super.openImageSet(files);
  	}