如何在Eclipse e4应用程序的菜单/工具栏中创建切换/单选项？

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.4"?>
<plugin>
   <extension point="org.eclipse.ui.commands">
      <command
            name="ToggleOption"
            id="com.example.command.toggleOption"
            description="Toggle Option">
      </command>
   </extension>
   <extension point="org.eclipse.ui.handlers">
      <handler
            commandId="com.example.command.toggleOption"
            class="com.example.handlers.ToggleOptionHandler">
      </handler>
   </extension>
   <extension point="org.eclipse.ui.menus">
      <menuContribution
            allPopups="false"
            locationURI="menu:org.eclipse.ui.main.menu">
         <menu
               label="Options"
               mnemonic="O"
               id="com.example.menus.options">
            <command
                  commandId="com.example.command.toggleOption"
                  label="Toggle Option"
                  style="toggle">
            </command>
         </menu>
      </menuContribution>
   </extension>
</plugin>