- I added a repository to SourceTree, then manually (via command line) added a submodule in it. The submodule doesn't appear in the sidebar.
- I added the submodule to the repo before importing the repo into SourceTree. Nothing
- I added a new submodule in the repo from SourceTree, using the "Add Submodule..." option when right-clicking the sidebar. The submodule is added correctly, I commit and push it. NO SUBREPOS ARE SHOWN IN THE SIDEBAR

Notice in the attached image: The current HEAD has 2 submods in the .gitmodules file, and the directory of the 2nd was just added. Nothing on the sidebar. It's supposed to look like this: http://blog.sourcetreeapp.com/2012/02/01/using-submodules-and-subrepositories/