Setting "Include Signature Labels"

I have written a DXL script to configure a module for electronic signatures. Part of the script creates and configures the Signature Labels.

When I view the signature configuration dialog after running the DXL, I see a dropdown that shows the appropriate enumerated attribute. However, the "Include Signature Labels" option is not set, and I can't find a way to set it using DXL.

Any help will be greatly appreciated.
ZenMonkey760 - Fri Mar 15 19:29:57 EDT 2013