Intellilist Cancelling

I know that there is probably an obvious answer to this, but when the user types something different while a list is open and then presses space, what they typed is replaced by what was the closest match in the list even though they didn't actually select that item.

For example, say I have the following items in the list:

Apply
Bear
Cup
Dog

And the user types

Customer

When the user presses space after typing Customer, the list goes away and replaces customer with Cup since that was the closest match. However, since the user never actually chose Cup, I don't want it to pick that item.

Is there a way to handle this.

Thanks