Deleted submit for text entry box and need it back.

I am using captivate 9's most recent update. I have 4 text entry boxes on the same slide. I deleted 3 of the submit buttons thinking that only using one would be fine. Is it possible to retrieve the deleted submit buttons. I could just recreate the text entry boxes but the variables created by these boxes are already linked through out my project and it would be a pain. Any advice would be much appreciated!