You can re-asign your drop-down styles (found in the css) to take the shape of your newly created “list”
Find out what class or ID your list is being rendered too and either change that to the previous class or ID of the exsisting drop down menu or change the css to match the name of the newly rendered.
To find what the current class is you can right click anywhere on your browsers white(empty) space and click the option to View Source.
Find some of the links and deter which class or ID they call. look for these Items
<ul class=” — whatever its named —“>
or
the container that surrounds it
<div class” — whatever its named —“>
Let me know