popupMenus的可见性有关问题

popupMenus的可见性问题
要求点文件时不可见

我是这样写的

XML code

         <visibility>            <or>               <objectClass                     name="org.eclipse.core.resources.IProject">               </objectClass>               <objectClass                     name="org.eclipse.core.resources.IFolder">               </objectClass>            </or>         </visibility>