Please check the demo DropDownList at the above link. Try navigating using the Numpad keys (keys on the left of the keyboard), there is one option that starts with “2”, select a different option and press number 2 on the numpad, you’ll see no navigation happens. However if you repeat the same with the keys above the alphabets you’ll navigate.
It’s First letter – press a key to navigate to a matching item. Subsequent press on the same key will iterate over the matches. that’s not working with numpad. Navigating up and down works fine.