yeah but that's not what I was looking for, on the pc photoshop has a solid background for the entire screen and when you have more then one image up you can move them around on that background. On the mac you see the desktop behind it and is rather distracting.
This is because Windows has no independent Menu Bar like the Mac OS does.
In order to achieve this, Windows must create an actual window to house the menus for an application. You see a similar thing with the iTunes and QuickTime versions for Windows.
Photoshop was originally developed and designed for the Macintosh platform (it didn't come to Windows until about 4-5 years after it was first released). Macs don't need to create a window for an app's menu, as it simply changes the Menu Bar to fit to whatever the app in focus is.
So in reality, there shouldn't ever be an encasing window around the app, since the original intent didn't call for it.
Now Windows obviously doesn't work this way, so Windows has to make due with what it has and create a new Window for the menu.
So, there really isn't a way to make an encasing window for the Macintosh version, since that isn't how the OS works or deals with apps.