How can I put two images into a Skitch file?

I have a question about using more than one image for Skitch. I know that it's supposed to be a screen-shot thing, but lately I've been using it to make graphics as well. My question is how do I put two images into a Skitch document, if you will? Right now, if I drag image A into the image I'm currently working on, image B disappears and image A takes over. How do I fix this?
 
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