code: private void updateLookAndFeel(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_updateLookAndFeel
          String lookAndFeelName = (String)lookAndFeelComboBox.getSelectedItem();
          String lookAndFeelClassName = (String)mapLAndF.get(lookAndFeelName);
          if ((lookAndFeelClassName != null) && (!ScreenUtil.DEFAULT.equalsIgnoreCase(lookAndFeelClassName)))
              properties.put(ScreenUtil.LOOK_AND_FEEL, lookAndFeelClassName);
          else
              properties.remove(ScreenUtil.LOOK_AND_FEEL);
  
          ScreenUtil.updateLookAndFeel(this, null, properties);
          this.setSampleStyle();
      }
docs: GEN-LAST:event_textColorButtonActionPerformed