I was checking out your example: ZIM - Dropping - Code Creativity and stumbled upon very strange behavior.
When I copy the code and put it on my test site: ZIM - Dropping - Code Creativity - it works.
But when I put your code in Animate (on the first frame in the timeline and this.stop(); above it), List() works until I release the mouse button while dragging. Then it turns out that you can't drop the item in the list down. Everything else works.
Here is the link with code exported from Animate: ZIM017.
What could Animate be doing that breaks the functionality of List()?