How to automatically set the changed attributes on sheets?

When a sheet is changed, the attribute flag 'changed' is not yet set. When opening the revisions assistent, a first step is to check every sheet for changes and to toggle this very flag to true.

How can I trigger this "search for changes in sheets and set attribute 'changed'" from within my C# plugin? I can just find API functionallity to start the revision itself which I do not want.

Thank you!