Using Fire TV remote

I am porting one of my games to Fire TV and need to make use of the remote to control menu navigation. My menus are done with NGUI and so I thought I can use the UIKeyNavigation to control the menu since the remote sends keycodes that map to arrow keys. This doesn't always work on sub menu windows. My question is can I implement a cursor and then use the remote to control the cursor or must I implement the keycode scheme as I started. How are other games using the remote to control menu navigation on Fire Remote TV?