With regard to foreign key index binding, Dan Guzman blogged in depth about this :

"SQL Server chooses the index binding based on rules that vary by version so you will...

This is an old thread, but what worked for me was editing the task name for some reason enabled the OK button.

Am I the only one dismayed that online indexing is not included in Standard Edition!!

I read through the Daily Updates maybe once a month or so.

Just adding this for completeness.

Although it is not an answer option to the QOD, but the best way to...