Sidebar Dropdown Menu

Maybe you can help. I have been losing my mind trying to find a way to put a dropdown menu on my secondary sidebar. I'm currently using Custom Menu Widget but there is no dropdown option so all of my categories are lined up one under the other and taking up a whole page. Any advice?? Every accordion widget I find originates from the Post page so I cannot put categories in it. I know this isn't in the scope of your theme but perhaps you know of some way? Thank you sooooo much!!! Kim hidemyage.com