searchboxex AppQueryTerms枚举的有效值是什么？

I'm building a custom search page and attempting to use an existing custom search scope. I'm having success using the SearchBoxEx with the AppQueryTerms = "ContentType:'my custom content type name'" but when i try using AppQueryTerms = "Scope:'My Custom Search Scope'" I get no errors, but also no proper results. I know my scope is populated using the advanced search so I must be using AppQuwryTerms wrong.I'm building a custom search page and attemptin