>>It's an option. You can have solution explorer select the current document. FYI, this option existed in VS2012
>
>What I meant is this:
>
>VS 2012
>
>Go in Solution Explorer
>Click on a class
>You will see it appear in the main window
>From the Solution Explorer click on another class
>You will see it appear in the main window
>Close that window
>See that the Solution Explorer has bounced back to the first class
>
>If you do the same thing in VS 2013, it will not.

See if Tools/Options/Projects & Solutions/General : 'Track Active Item in Solution Explorer' has the same setting.