How to stop "Projects have recently been added to this solution." popup

[AngryJ]

For the past few weeks, every time I open my solution, I get a popup with the message "Source Control" "Projects have recently been added to this solution. Do you want to get them from source control?" The popup has three buttons: "Yes", "No", & "Help". Neither "Yes" nor "No" do anything, and clicking "Help" just takes you to "docs.microsoft.com"! (NOT helpful!) What does this message mean? How can I find out what projects TFS thinks have been added to the solution? How can I stop this popup from popping up EVERY TIME I load my solution?

Py5D6dJy

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