The following style is never taken into account by Synth look and feel when applied on a checkbox menu item:

<style name="cbMenuItem">
  <state value="DISABLED and SELECTED">
    <color value="#9D9A76" type="TEXT_FOREGROUND" />
  </state>
</style>
<bin key="CheckBoxMenuItem" type="REGION" style="cbMenuItem" />
###@###.### 2005-05-26 21:55:07 GMT