<visibleWhen checkEnabled="false">
<with variable="activeWorkbenchWindow.activePerspective">
<equals
value="customplugin.perspective">
</equals>
</with>
< visibleWhen>
表达式列表:[url]http://wiki.eclipse.org/Menus_Extension_Mapping[/url]
关于menu的官方资料:[url]http://wiki.eclipse.org/Platform_Command_Framework[/url]