I\'m working in TFS with my team for project and the problem occurs when I\'m trying to make new modeling project for my classes, it doesn\'t show up in pending changes.
I have successfully checked in files from source control explorer instead of solution explorer in this case. Then after that it has worked again
VIEW > Other Windows > Source Control Explorer
It looks like your solution binding is broken. Either click yes on the question to bind your solution to source control, this is information that must be stored in the solution file and while Visual Studio does see that the folder is mapped to source control, it also sees that your solution isn't (did you check the add solution to source control checkbox when you created it?)
Optionally try opening file -> Source Control -> (optionally) Advanced -> Manage Source Control. You can select project in your solution individually and then click the bind button on the toolbar to bind them to sourcecontrol manually.
I had the same issue and solve it by clicking: File -> Source Control -> Advanced -> Refresh Status
I had a similar issue and, in my case, the solution was to right click on my project and choose Source Control->Go online. Apparently I must have somehow been switched to the offline mode.
Other way to do it: File--> Source Control --> Advance --> Change Source Control.
In the window displayed select all the projects you want to bind to the TFS
In VS2013+, you can check if your solution is online. In my case, due to VSO service outage, my solutions went offline. I had to open the solution, File > Source Control > Go Online
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