Can a slider be used as Container’s background

I have a drop down menu in a Flex within a container that is currently holding a background picture. It would look far nicer if this static backdrop photo could change cyclically. It does not seem possible to drop a slider into the background picture well. Is there another way that I can get the background picture to change? I have tried starting with the background component and dropping a slider of 3 or 4 photos and this works. However, I can’t seem to put a drop down in the same container? Anyone able to help a noob like me?