Shaded views, changing the default sky colour?

[dwall]

I am working with shaded view walk throughs, and I would really like to be able to change the default blue colour of the background sky. Is this possible in Revit? Am I just missing some really obvious little menu that would do this for me?

[dwall]

Never mind me - I just realized (of course it was after I posted the question) the dumb blue colour was a result of the glass windows I was looking thru from the interior of the residence...