I had a solution with 5 projects but two were in source control but never showed as checked out.
I was looking for a way to "bind" these to TFS that option was not showing up. This link shows how to do it.
To bind source control projects and solutions to Visual Studio
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Highlight the project or solution you wish to bind to Team Foundation source control in Solution Explorer.
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From the File menu, choose Source Control, and then choose Change Source Control.
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In Change Source Control dialog box, click Bind.
To unbind source control projects and solutions to Visual Studio
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Highlight the project or solution you wish to unbind in Team Foundation source control in Solution Explorer.
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From the File menu, choose Source Control, and then choose Change Source Control.
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In the Change Source Control dialog box, highlight the solution or project you wish to unbind from source control, and in the toolbar, click Unbind.