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
You may have to delete the bindings of existing projects that failed to bind correctly.
Then close the binding dialog.
Now you can add each of the disconnected projects from your solution explorer.
This ranges somewhere between buggy and pathetic, but if you click around on sufficiently many seemingly unrelated menus, context menus, and dialogs, you may guess how to repair the TFS connection like this