private void changeBackground() {
    String background = (String) comboDisplayBackground_.getSelectedItem();
    opts_.displayBackground_ = background;
    setBackground(guiColors_.background.get(background));

    if (parent_ != null) // test for null just to avoid crashes (should never be null)
    {
      // set background and trigger redraw of parent and its descendant windows
      MMStudioMainFrame.getInstance().setBackgroundStyle(background);
    }
  }
 public void dispose() {
   super.dispose();
   savePosition();
   gui_.refreshGUI();
   gui_.selectConfigGroup(groupName_);
 }