I opened a solution in offline mode. But now I am trying to go online and connect to tfs but I cannot seem to see the \"Go Online\" Button under File-> Source Control.
I
I found out that the "File > Source Control > Go Online" menu item doesn't appear when the "Source Control Explorer" window is active.
So you will have to open a different window and\or file.
In my case, when I opened a .cs file within a project of the open solution, the "Go Online" menu item was available once again.