How can I specify a TFS Workspace using Team Foundation Get action

[JLanda]

After renaming my local Workspace "Nightly" to "BuildMain", none of the Team Foundation Get actions in my .bld project work anymore. They return they following:
"Step default property 'Command' = 'Get'
"C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\tf.exe" Get /force /noprompt /login:domain\username,password /recursive $/ABC/misc
TF14061: The workspace Nightly;DOMAIN\username does not exist.
Process completed with exit code 100"

I cannot modify the Options tab of the step to specify the local Workspace because it will not accept input. I don't see the Workspace being specified in the commandline (above), so where is this default Workspace value being pulled from? I've looked everywhere.

Very frustrating, I would appreciate any insight.

Thanks in advance.