CloudBees Docker Build/Credentials Plugin question

[rudy...@gmail.com]

My Jenkins installation is using the CloudBees Docker Build and Publish Plugin version 1.2.1 and the Credentials Plugin v 1.28.

When I go to configure my Docker Builder and set my Registry Credentials I can only seem to add the credentials to Global Credentials, despite creating my own credential domain AND creating a username/password credential in my User configuration (neither of which appear in the Registry Credentials drop-down.  I don't want my Registry Credentials to be Global.  

Any help would be appreciated