Can't open library window in Interface builder

[saiRam]

Hi Folks,

I am using a MacBook Pro and installed Xcode 3.2.5 along with ios 4. I created a sample Cocoa Application. When I clicked on nib file, It opens Interface builder. In interface builder, I could not see library window which contains all the buttons etc need to start the design. Any help on this would be highly appreciated...

Thanks,
saiRam..