Review downloaded metadata has no "Previous" button

[qwertyuio]

I frequently use the Download Metadata featrue on multiple books at a time to cleanup my metadata data. One issue I have when stepping through each book in the "Review downloaded metadata" dialog is the lack of a "Previous" button. Sometimes after clicking "Next" I realize there was something I didn't check on the previous book (usually the tags as I don't want my custom tags overwritten). But there seems to be no way to get back to the previous book other than cancelling updates to all books and starting again.