code: private void installDefaults() {
          // Basic
          setFont(UIManager.getFont("InternalFrame.titleFont"));
          closeButtonToolTip   = UIManager.getString("InternalFrame.closeButtonToolTip");
          iconButtonToolTip    = UIManager.getString("InternalFrame.iconButtonToolTip");
          restoreButtonToolTip = UIManager.getString("InternalFrame.restoreButtonToolTip");
          maxButtonToolTip     = UIManager.getString("InternalFrame.maxButtonToolTip");
  
          // Synth
          updateStyle(this);
      }
docs: Install the defaults and update the Synth Style.