I've installed the latest Scientific Linux 6. But when I opened the included Nautilus file manager, there is no file tree sidebar and no toolbar, nor status bar. How do I activate them? 
How to show Nautilus toolbar and file tree sidebar?
nautilus
For the sidepane, you can either hit F9 or go to View and select sidepane.Similarly, for the toolbar and status bars, select them from the View menu.