Data Source - new text file missing from Choose Tables

New text file is missing from the Choose Tables dialog until you exit and reopen Visual Studio.

Here's what I've been doing as a workaround: create the web test, create the text file, close Visual Studio, open solution, and add a new Data Source to the web test

I also tried Save All then reopen the solution, but that didn't work.

I reported this as a bug to Microsoft today: https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=297000