When you try add new item from BizTalk project, following is what you normally see
However when something went wrong, you only see a few items in it or doesn’t see at all. Environment above was Visual Studio 2013 Update 5 but this problem existed from old days.
The easist way to fix is excuting following commands from Visual Studio’s bin directory.
If problem still exists, remove Developer Tools and SDK from BizTalk install and add it again.