Inheritance: IVsExpansionEnumeration
 public int EnumerateExpansions(Guid guidLang, int fShortCutOnly, string[] bstrTypes, int iCountTypes, int fIncludeNULLType, int fIncludeDuplicates, out IVsExpansionEnumeration pEnum) {
     pEnum = new VsExpansionEnumerationMock();
     return VSConstants.S_OK;
 }
 public int EnumerateExpansions(Guid guidLang, int fShortCutOnly, string[] bstrTypes, int iCountTypes, int fIncludeNULLType, int fIncludeDuplicates, out IVsExpansionEnumeration pEnum)
 {
     pEnum = new VsExpansionEnumerationMock();
     return(VSConstants.S_OK);
 }