docs: private void backgroundButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_backgroundButtonActionPerformed
          Color color = ScreenUtil.getColor(ScreenUtil.BACKGROUND_COLOR, null, properties);
          color = JColorChooser.showDialog(this, java.util.ResourceBundle.getBundle(DIALOG_BUNDLE).getString("choosebackgroundcolor"), color);
          if (color != null)
              ScreenUtil.setColor(ScreenUtil.BACKGROUND_COLOR, new ColorUIResource(color), null, properties);
          else
              properties.remove(ScreenUtil.BACKGROUND_COLOR);
          
          ScreenUtil.updateLookAndFeel(this, null, properties);
          this.setSampleStyle();
      }