code: private void fontComboBoxActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_fontComboBoxActionPerformed
          String fontName = (String)fontComboBox.getSelectedItem();
          if (!this.getDefaultText().equalsIgnoreCase(fontName))
              properties.put(ScreenUtil.FONT_NAME, fontName);
          else
              properties.remove(ScreenUtil.FONT_NAME);
  
          ScreenUtil.updateLookAndFeel(this, null, properties);
          this.setSampleStyle();
      }
docs: GEN-LAST:event_sizeComboBoxActionPerformed