Add SQL Server Express "Advanced" features to LocalDB installed by Visual Studio

I installed VS 2013. It installed SQL Server 2012 Express with LocalDB. That's great, except that I need full-text search, and it didn't install "Advanced Services" (and I didn't see an option during install). I've downloaded SQL Server 2012 Express w/Advanced Services to add this, but it seems to want to install it on a new instance. Does this sound familiar to you? How did you add SQL Server Advanced Services to your LocalDB installation? I had the same issue last VS version, and resorted to reinstalling SQL Server then. I apologize for coming to the community with a mundane question, but it vexes me. :) Here's what I did: - start the SQL Server Express Advanced install - choose to modify an existing instance - check "full-text" under Instance Features / Database Engine Services - find that the installed instances list is empty at the "Instance Configuration" screen, and it wants to install a new instance