Down movement via down arrow not working, with dynamic reorderer
Steps to reproduce:
1) Open the dynamic reorderer manual test
2) Using the keyboard tap the "tab" key until one of the reorderable elements has focus.
3) Attempt to move one of the reorderable elements down in the set
Notice that crtl-down arrow doesn't work. You can move items down in the list by going up and having it scroll around, or by using the ctrl-right arrow.