Use the Hide function in the Inspector under the Data tab. Tell it to hide the trash can graphic when the primary key does not exist and that should do the trick!
that is so obvious I am embarrased I asked. A great addition to FP13 that I use allot and did not put 2 and 2 together.
Thank you for answering.
Been there... done that... and in front of a group of people too! <grin>