A little help with background color

Hello guys, I’m new here.

I was wondering, how could I change the background color in different scenes ? I tried changing through the document properties window (Where you could set your resolution, frame rate, background color etc), and the other scenes were all set at the same background color.

Is there a way to change this ?
Or perhaps should I create a rectangle on a single layer and lock it and apply the color I need ? Or perhaps thru AS ?

I hope to receive a favourable reply. Thanks.