private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton1MouseClicked
        this.jPanel2.setVisible(false);
        this.jPanel3.setVisible(false);
        if (this.jPanel1.isVisible())
            this.jPanel1.setVisible(false);
        else
        {
            this.jPanel1.setVisible(true);
            jSlider1.addChangeListener(new MyChangeAction());
        }
    }//GEN-LAST:event_jButton1MouseClicked