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See attached screenshot. I maximized Projects panel and IMO there should be a visual separator of title bar and content area. For comparison I did the same with editor tab (with hidden editor toolbar) and that one behaves correctly.
Created attachment 68754 [details] screenshot
Product Version = NetBeans IDE Dev (Build 080901) Operating System = Linux version 2.6.24-19-generic running on i386 Java; VM; Vendor = 1.6.0_06; Java HotSpot(TM) Client VM 10.0-b22; Sun Microsystems Inc. Runtime = Java(TM) SE Runtime Environment 1.6.0_06-b02 Java Home = /usr/lib/jvm/java-6-sun-1.6.0.06/jre
works fine on Windows