Visual Studio 2015 Update 2 adds the new Publish button to the status bar to provide a quick and easy way to get solutions into source control:
“[The Publish button] aims to provide a quick and easy way to get solutions into source control. With this new publish compartment, choosing a source control provider and adding your solution will be achievable in as little as one click!
Out of the box, Publish will automatically wrap your solution in a Git repository and switch focus to the Sync page in Team Explorer to allow you to add a remote and publish your solution. As more providers support this feature, the Publish button will allow you to choose which source control you’d like to use for a given solution.”
If you don’t need this functionality, you can use the Hide the Publish button in the status bar of Visual Studio 2015 Update 2 extension for Visual Commander.