Unable to select SearchPanes filter entries with keyboard

tuf37504

**Test case: **
https://datatables.net/extensions/searchpanes/examples/initialisation/simple.html

Description of problem:
Tabbing through the Search Panes doesn't allow the user to interact with selecting a filter value. It skips from the controls (search, sorting, collapse/expand, etc) to the actual table. However, stopping on one of these controls and pressing the down arrow key move the cursor into the search pane table. But, using the enter key does not select a filter value.

I would have loved to use Search Panes for my project, but federal laws prevent me from implementing it as it would prevent keyboard-only users from successfully using the application.

Is there a workaround that I'm unaware of?