Greyscale and Color Images

I looked in the memories, but the closest answer I could find to my question was from this post.

I have a greyscale icon and I want to paste a color image into the corner. The problem I'm having is that as soon as I paste a new layer (or selection) onto my greyscale image, my color image automatically turns B&W. Is there a way I can have it, so it won't do this? I use PSP8.