VS 2013 "Go to Definition" Tab Placement

I just made the jump from VS2010 to VS2013 and have encountered an odd bug/feature with no apparent workaround.

In VS1010 I'm accustomed to clicking "Go to Definition" on the context menu above a highlighted class so as to open the relevant .cs file in a new tab.

VS2013 has this same feature but for some incomprehensible reason it docks the new tab to the right, and to make matters worse, subsequent calls to "Go to Definition" to view additional classes result in the tab of the previously sought out class being closed.

I discovered that these awkwardly placed tabs can be kept open and aligned properly, just like a user would expect, by manually clicking the tiny "keep open" button. But having to do this each and every time I navigate to a class via "Go to Definition" is a real workflow hinderance.

Is there any way to turn off this strange behavior?

Illustration #1: Clicking "Go to Definition" on a highlighted class...

Illustration #2: Strange right-aligned tab is the result:

In the options, in Environment > Tabs and Windows, uncheck Allow new files to be opened in the preview tab.