Named branches in Mercurial

Hi,

When my product releases every 2 weeks we create a new named branch off of the 'default' branch.  We only want to build release builds every 2 weeks after we've set up a named release branch.

The easiest way I think to do this is to update the "Default branch:" setting in the "Edit VCS" page.  Normally the "Default branch:" has a value of "default".  When I change the value  to one of our release branches (release-11 in this case) I get this error:

"Failed for the root 'OnlinePM-TestBranching' #1989: Cannot find revision of the default branch 'release-11' of vcs root mercurial: https://hg.mycompany.com/OnlinePM/TestBranching

It appears like team city isn't working correctly.
All I really want team city to do is to run the command: hg clone source destination -b release-11

I've spent a few hours trying to get this working.  Anyone out there know how to specify the exact branch I want to generate builds from with team city and mercurial?