Toggle/un toggle unit banners?

[gnosis89]

Is there any way to toggle/un toggle unit banners with a hot key? I see no option in the menu, although in the battle interface menu I can toggle them on, off or only on mouse over. I'd like to be able to press a key and toggle them on or off, because I find it adds to the realism and cinematic experience, however I use them often when needing to command troops and don't want to have to go to the menu every time to toggle them.

Edit:
And if I cannot through the game UI, is there another way?

[Morticia Iunia Bruti]

Try to press k.