How do you Convert CMYK to RGB

I have a project that I need to convert all of the AI files from CMYK to RGB. This use to be very simple back-in-the-day by just choosing Filter > Convert to RGB. I know about Document Color Mode and Convert to RGB.
When I select all of the objects and choose RGB under Document Color Mode, I still see CMYK plates when I preflight the PDF. Depending on what the Document Color Mode is set on, I either have Convert to RGB grayed out or always available. The resulting file show up as CMYK in both Quark and ID along with CMYK plates when I preflight the PDF.
What am I missing here?
AI CC 2014

Can you be more specific? Which option are you interested in?

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