Chaining catkin workspaces on Windows

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I'm been able to install ROS Groovy on Windows using the win_ros instructions (thanks to the win_ros guys for all the great work on that recently!). I'm having trouble building my own catkin packages though. How do you set up a chained catkin workspace on Windows? Is this even a feature that is supported yet?

I have my main ROS workspace in c:\win_ros\src, c:\win_ros\devel, and c:\win_ros\build. Everything built properly and the tutorial apps work. I'm trying to create a new workspace for my catkinized packages in c:\my_ws in the same way I do on Linux but without success. I've tried the following:

 c:\win_ros\devel\setup.bat
 cd\my_ws
 winros_init_workspace ./
 winros_init_build
 winros_make

Cmake is unable to find catkin and gives the following error:

CMake Error at CMakeLists.txt:47 (message):
  find_package(catkin) failed.  catkin was neither found in the workspace nor
  in the CMAKE_PREFIX_PATH.  One reason may be that no ROS setup.sh was
  sourced before.


-- Configuring incomplete, errors occurred!

Executing nmake in the root build directory

Any suggestions? Thanks.