void _setContentPane(JPanel pane, String titulo) {
    boolean visibilidad = this.isVisible();
    this.setVisible(false);
    super.setContentPane(pane);
    ajustarYCentrar(this, pane);
    // try { Thread.sleep(1); } catch (InterruptedException ignored) { }

    if (titulo != null) {
      setTitle(titulo);
    }
    generarFondo(this);
    this.setVisible(visibilidad);
    this.repaint();
  }
 public void setTitle(String title) {
   super.setTitle(title);
   this.objectTable.setToolTipText(title);
 }