C# SheetSetManager PublishOptions

[dix]

Hello.

I know the interface functions
to set the Location field, etc...

But I can not find a function
to set the field: "Block information"

This is highlighted in blue in the screenshot.

Please tell me how to set (it false / true).
Please help me.

AcSmSheetSet oSheetSet = sheetSetDatabase.GetSheetSet();

IAcSmPublishOptions ap = oSheetSet.GetPublishOptions();
IAcSmFileReference ff = ap.GetDefaultOutputdir();
ff.SetFileName(filename);
ap.SetDefaultOutputdir(ff);
ap.SetLayerInfo(true);