Disclaimer The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.
There is a good article on DevX about the xStrip controls. MSDN has a good technology overview as well. The Toolbar, menu and status bar render in a look (by default) that is similiar to Office xp. Understand that the Menu, Toolbar and StatusBar all derive from a common base, ToolStrip. ToolStrip is a container for ToolStripItem controls. The ToolStrip uses Renderers to control its display. Look at the RenderMode property for more information.
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