web/test/oaassist/EtOAAssist/ribbon.xml

<customUI xmlns="http://schemas.microsoft.com/office/2006/01/customui" onLoad="OnWPSWorkTabLoad" >
  <ribbon startFromScratch="false">
    <tabs>
      <tab id="WPSWorkExtTab" label="OA辅助" getVisible="OnGetVisible">	<!-- OA菜单开启显隐处理-->
        <group id="OAEntryGroup" label="OA常用功能">
          <button id="btnSaveToServer" label="保存到OA" onAction="OnAction" 
              getEnabled="OnGetEnabled" getImage="GetImage" size="large"/>
          <button id="btnSaveAsFile" label="保存本地" getLabel="OnGetLabel"  onAction="OnAction"  
              getEnabled="OnGetEnabled" getVisible="OnGetVisible" getImage="GetImage" size="large" />
        </group>
      </tab>
    </tabs>
  </ribbon>
</customUI>