Visual Studio minimize undocked windows

Question

I would like to minimize undocked windows in Visual Studio 2012. I know that it is possible(maybe it was a extension) but before I reinstalled Visual Studio my undocked windows where independent of the main window. Take alook at this screenshot:

There is now minimize button. Does anyone know where I can change that?

Answer 1

Tools --> Options --> Environment --> Tabs and Windows

Uncheck "Floating tab wells always stay on top of the main window"