BAsic auth params from external file

I'm trying to keep my basic auth passwords in an external file so that I can check my projects into cvs safely. I have been able to successfully use a groovy script to set the value to the settings of the application using java properties...

SoapUI.settings.setString("BasicAuthPass", myPass)


However, I can't for the life of me figure out the correct EL syntax (or maybe it is not possible?) for accessing this property in the Default Password field of the Outgoing WS-Security Configurations tab or the headers tab in a test case step.

Can anyone help with the syntax, let me know that EL is not possible in these fields, or point me to a place to learn more about it?

Thanks!