Ultra Checkbox not false at 0.

[reprise5]

Refill

If using the refill button, (regardless if the value goes to 15 or 0), the item's Ultra checkbox will be set to false.
but:

Decrement button

if using the decrement button all the way to 0, Ultracheckbox doesn't reset to false.
Pressing enter or submit doesn't take Ultracheckbox into account.

Using jspinner

If using the jspinner, the submit action is required to update the form, but doesn't take the Ultra ckeckboxes into account.