I couldn't stand driving in the daytime with the sun glaring, and didn't want to look for/buy an OEM sunroof cover. So I made my own for ~$20.
Check it out:
http://tinyurl.com/mmy6v9
:biggthump

The OE sunroof has a sliding cover.

I'll give you credit for an effective and inexpensive DIY for your aftermarket sunroof.